Owner reviews for engine oil

I have an 2007 A4 2.0T base. I bought the car with 120k miles on it in 02/19. Yesterday I hit the 224k miles on it. She's my daily driver, over the years I have changed/did the engine oil every 4k miles, car filters all over, wheel alignment, tires, brake pads, rotors, and the battery. Nock on the wood, my baby have been taking car of me. I'm actually surprised that this model is solid af.

I live in WNC I run 5 30 mobil 1 high mileage year round. Motorcraft filter

295,000 miles using Castrol GTX high mileage and fram XG filter

Rotella T6 now comes in 10w-30 as well as a 5w-40 both are excellent choices.

I drive a 2021 RAM 1500 Classic and use only Pennzoil Ultra Platinum with the extended guard filter cartridges. I change my filter cartridge at 5,000 miles and reset my light then at around 10,000 miles, I change the oil and cartridge. There was one time I forgot to change my oil before winter and didn't feel like doing it in the cold so I ended up around 15,000 miles before changing it. The oil was still fairly clean.

I used AMSOIL signature, and do yearly oil changes.

I don't think so, I've been using High Mileage 5w-30 Mobil 1 year round since 180k miles now at 240k. Though, I have started using the Honda Filter compared to Mobil 1.

I would take a good look at the brake fluid and stale gasoline but the rest should be fine.

I only use Mobil1 High mileage. Everytime I drop the oil at 100%, it feels less oily? Kinda less slippery? Definitely darker than I would like. My feeling is change it a little early.

This sub loves to praise motul, but it caused me to foul up my spark plugs and have misfires. I tried both the 5W30 like the manual calls for and 5W40, but shortly after I changed to motul my plugs fouled up. I replaced them, they fouled up and misfired again. I tried it a third time cleaning the MAF sensor, checking if the plugs were torqued okay, checking the seal on the coil packs, etc... still fouled up. I finally guessed it was the motul and did an oil change away from motul and swapped the plugs again. 14k later no fouling.