Mobil 1 55221 3309 Automatic Transmission Fluid - 1 Quart (Pack of 12)

As a dedicated DIY mechanic, I trust Mobil 1 synthetic products implicitly, and their 3309 ATF is no exception. This 12-quart pack is the only way to buy this fluid if you handle your own maintenance, offering both the highest quality protection and fantastic cost savings over purchasing single quarts at the auto parts store. The synthetic formula is where this fluid truly shines. After switching to Mobil 1, the transmission in my vehicle shifted noticeably smoother and quieter, especially during cold starts. It provides superior thermal stability, which is essential for protecting the transmission during heavy towing, hot climates, or stop-and-go traffic. It gives me peace of mind knowing the fluid is protecting critical internal components under the harshest conditions. The convenience of the 12-quart case is perfect. Whether you're doing a full fluid exchange or just a pan drop and refill, having the necessary volume on hand prevents frustrating last-minute runs to the store. This specific formula meets key manufacturer specifications and is a direct substitute for much more expensive dealer-branded fluids. If your vehicle calls for a high-quality 3309-spec fluid, this is the best protection you can buy in the most convenient package.

Shipping was fast! The 12 bottles arrived packed in their original packaging, 6 per box. No damage, perfect condition.

Have been running this in AISIN AS69RC for a few years now with no issue. Fluid looks fine on factory flushes, trans doesn't overheat, shifts perfect (well, after being flashed with an update at the dealer, but that had nothing to do with fluid). Don't wait your money on the stuff from MOPAR/FCA, it's a marketing gimmick. Plenty of people running this and it does just fine.

did the trick

Been using this Mobil Specification JWS3309 Automatic Transmission Oil required for Volvos, in this case a 2006 Volvo S40, with 150K miles. I change the fluid once a year by draining the pan, no gasket or pan removal since this is a sealed transmission. Even though Volvo says the fluid doesn't require changing, rest assured the fluid oxidizes and turns black with all that grime from constant metal friction and heat generated by many miles of usage. For a complete transmission flush, drain the pan, about 4qts. and refill through the transmission dipstick tube, with a plastic tube hand pump, the same amount as removed. Run the motor a few minutes and cycle by repeating this process FOUR times until all 12 qts. in the package are used up. Before the last top-off I also add and highly recommend a bottle of Prolong Automatic Transmission Treatment. Through the years I have had no problems, no leaks, no smoke, no hesitation, in fact the motor and transmission runs good as new. This Mobil 3309 ATF is pure mineral based oil, not semi-synthetic. This is NOT MOBIL 1, which is a pure synthetic ATF and is NOT compatible with JWS3309 specifications like the regular Mobil 3309. STOP confusing and using Mobil 1 which this oil is NOT, only the brand name. Several companies now make ATF that is JWS3309 specific, as required by Volvo. I have used and highly recommend, this regular Mobil 3309 for many years with no problems, read your owners manual, using anything else is at your own risk.