Below you will find the best synthetic oil for a 2003 Toyota TUNDRA. Maximize your vehicle's potential with 100% full synthetic oil that is made in the USA! For more than the past 50 years, AMSOIL has perfected the art of maximizing efficiency and engine life. The advanced synthetic formulas deliver superior protection from heat, friction, and wear, keeping engines as good as new for miles. Upgrade to AMSOIL today and experience better performance, reliability, and reduced oil consumption. Click add to cart for more details. Sign up as a preferred customer and get discounts and more! The oil type, capacity and oil filter (if available) are listed below and verified for accuracy. Upgrade now!
Recommended oil for my 2003 Tundra
| Product Name | Product Description | Capacities | Product |
|---|---|---|---|
| Signature Series 5W-30 Synthetic Motor Oil | Save time and money and costly repairs at the auto shop! Amsoil has your back! Bullet proof your Tundra's engine! | With filter 5.5 quarts After refill check oil level. |
ASLQT-EA
Add To Cart  Add To Cart |
| XL 5W-30 Synthetic Motor Oil | Protect your Tundra with the best synthetic oil! Amsoil backs up all claims with proof! Support American Oil! | With filter 5.5 quarts After refill check oil level. |
XLFQT-EA
Add To Cart Add To Cart |
| OE 5W-30 Synthetic Motor Oil | AMSOIL OE Synthetic Motor Oil is specially made for the extended oil change intervals recommended for your 2003 Toyota Tundra 3.4L. It has advanced synthetic technology that resists chemical breakdown for maximum wear protection for your vehicle which is well beyond the traditional 3,000-mile oil change interval. | With filter 5.5 quarts After refill check oil level. |
OEFQT-EA
Add To Cart Add To Cart |
Recommended oil filters for my 2003 Tundra
| Product Name | Product Description | Product |
|---|---|---|
| AMSOIL Ea Oil Filters | Awesome filter for your 2003 Toyota Tundra which is recommended for 15,000 miles/one year, whichever comes first, in normal or severe driving conditions. |
EA15K51-EA
Add To Cart Add To Cart |
| WIX Oil Filter | Wix oil filters for your 2003 Toyota Tundra have extended OEM recommendations which match the drain intervals of AMSOIL XL synthetic motor oil which is 12k or 1 year, whichever is first. |
51348-EA
Add To Cart Add To Cart |
Recommended cabin & Air Filters for my Toyota Tundra
| Product Name | Product Description | Product |
|---|---|---|
| WIX Air Filter | Great air filter for your 2003 Toyota Tundra. |
42479-EA
Add To Cart Add To Cart |
Recommended transmission fluids for my 2003 Tundra
| Product Name | Note | Capacities | Product Description | Product |
|---|---|---|---|---|
| Manual Transmission & Transaxle Gear Lube 75W-90 | Manual Transmission Fluid |
R150 (RWD) 5.5 pints
R150F (4WD) 4.6 pints |
This synthetic manual transmission and transaxle gear lube is made to protect from friction and keep viscosity for extended component and fluid life. You will get smooth and fast performance from synchronizers and gears. Enjoy quick and smooth shifting. It is made to exceed protection under severe conditions and it blows the doors off of regular fluids which are limited in protection. Protect your 2003 Toyota Tundra. |
MTGPK-EA
Add To Cart Add To Cart |
| SEVERE GEAR® 75W-90 | Manual Transmission Fluid |
R150 (RWD) 5.5 pints
R150F (4WD) 4.6 pints |
This special formula is made for harsh operating conditions that pick-up trucks endure. Also top-notch protection for SUVs, heavy equipment, and other heavy-duty vehicles. Made in the USA. |
SVGPK-EA
Add To Cart Add To Cart |
| SEVERE GEAR® 75W-110 | Manual Transmission Fluid |
R150 (RWD) 5.5 pints
R150F (4WD) 4.6 pints |
This is a fantastic lubricant for towing trailers, heavy duty hauling, off road driving/4x4, commercial applications, and for race enthusiasts. This severe gear lube will protect bearings, gears from friction and exceeds performance of any regular gear oil out there! Keep your truck or vehicle out of the shop and avoid costly repairs with this made in the USA lube. |
SVTPK-EA
Add To Cart Add To Cart |
| SEVERE GEAR® 80W-90 | Manual Transmission Fluid |
R150 (RWD) 5.5 pints
R150F (4WD) 4.6 pints |
This lube is made to exceed the requirements of equipment and all vehicles that require SAE 80W-90 viscosity. It is made with synthetic base oils and top additives without adding any wax. Amsoil Severe Gear is solid against thermal breakdown. Will give you awesome protection for bearings and gears and tough against heat which will help extend the life of your equipment and avoid costly repairs. Made in the U.S.A. |
AGLPK-EA
Add To Cart Add To Cart |
| Signature Series Multi-Vehicle Synthetic Automatic Transmission Fluid | Automatic Transmission Fluid |
4 speed A340F Total Fill 10.7 quarts
2.1 quarts Initial Fill
4 speed A340E Total Fill 10.7 quarts
2.1 quarts Initial Fill |
Amsoil's Signature Series Multi-Vehicle Synthetic automatic transmission fluid is made to blow the doors off any regular or conventional ATF fluids on the market and our oil surpasses the performance needs of most vehicles. Protect your transmission and avoid costly repairs. This fluid has an advanced formula to give awesome top-notch protection under harsh operating conditions. Transmission repairs are expensive so protect your vehicle with this great fluid! |
ATFPK-EA
Add To Cart Add To Cart |
| OE Multi-Vehicle Synthetic Automatic Transmission Fluid | Automatic Transmission Fluid |
4 speed A340F Total Fill 10.7 quarts
2.1 quarts Initial Fill
4 speed A340E Total Fill 10.7 quarts
2.1 quarts Initial Fill |
Outsanding protection and resists varnish! Change interval based on your Tundra's recommendation. |
OTFQT-EA
Add To Cart Add To Cart |
Differential for my Toyota Tundra
| Product Name | Note | Capacities | Product Description | Product |
|---|---|---|---|---|
| SEVERE GEAR® 75W-90 |
Front 2.3 pints
4WD With LSD Rear 6.1 pints
RWD With LSD Rear 6.6 pints
U/K TRC 2.1 pints |
This special formula is made for harsh operating conditions that pick-up trucks endure. Also top-notch protection for SUVs, heavy equipment, and other heavy-duty vehicles. Made in the USA. |
SVGPK-EA
Add To Cart Add To Cart |
|
| SEVERE GEAR® 75W-110 |
Front 2.3 pints
4WD With LSD Rear 6.1 pints
RWD With LSD Rear 6.6 pints
U/K TRC 2.1 pints |
This is a fantastic lubricant for towing trailers, heavy duty hauling, off road driving/4x4, commercial applications, and for race enthusiasts. This severe gear lube will protect bearings, gears from friction and exceeds performance of any regular gear oil out there! Keep your truck or vehicle out of the shop and avoid costly repairs with this made in the USA lube. |
SVTPK-EA
Add To Cart Add To Cart |
|
| SEVERE GEAR® 80W-90 |
Front 2.3 pints
4WD With LSD Rear 6.1 pints
RWD With LSD Rear 6.6 pints
U/K TRC 2.1 pints |
This lube is made to exceed the requirements of equipment and all vehicles that require SAE 80W-90 viscosity. It is made with synthetic base oils and top additives without adding any wax. Amsoil Severe Gear is solid against thermal breakdown. Will give you awesome protection for bearings and gears and tough against heat which will help extend the life of your equipment and avoid costly repairs. Made in the U.S.A. |
AGLPK-EA
Add To Cart Add To Cart |
|
| SEVERE GEAR® 75W-140 | (1) Synthetic oil is required. |
4WD With O LSD Rear 7.4 pints
RWD With O LSD Rear 8 pints |
Made for high-demand situations, heavy trailer towing and hauling, great for off-road enthusiasts who demand more, commercial settings and racing enthusiasts. Protects gears and bearings from damage. Superior protection and beats out any regular gear oil. Recommended for many different vehicles. Trust Amsoil to protect your equipment and engine. Made in the USA! |
SVOPK-EA
Add To Cart Add To Cart |
Recommended coolants for my Toyota Tundra
| Product Name | Product Description | Capacities | Product |
|---|---|---|---|
| Passenger Car & Light Truck Antifreeze & Coolant | maximum protection for your 2003 Toyota Tundra under extreme temperatures and operating conditions! Lasts up to 150,000 miles or five years! (whichever comes first) | Initial fill 10.6 quarts |
ANTPC1G-EA
Add To Cart Add To Cart |
| Low Toxicity Antifreeze and Engine Coolant | Lasts in your 2003 Toyota Tundra for up to 150,000 miles or five years! (whichever comes first). Biodegradable! | Initial fill 10.6 quarts |
ANT1G-EA
Add To Cart Add To Cart |
What is the difference between regular oil and conventional oil? Regular oil, derived from crude oil, contains impurities and undergoes minimal processing. In contrast, synthetic oil is chemically engineered in a controlled environment, resulting in a purer product with a more uniform molecular structure. Synthetic oil offers better viscosity properties across a wider temperature range, providing smoother cold starts and superior protection under extreme conditions. It lasts longer between oil changes, reduces engine deposits and sludge buildup, improves fuel efficiency, and offers better oxidation resistance. Overall, synthetic oil offers superior performance and longevity compared to regular oil, making it the preferred choice for many modern engines.
