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Old 10-10-2012, 01:18 PM   #12
Scooby Newbie
Member#: 39983
Join Date: Jul 2003
2003 WRX Wagon


Originally Posted by bluesubie View Post
If you aren't having leaks then you may not need to switch. The Mobil1 HM oils have additional seal conditioners, have a thicker viscosity within the same grade, have a higher High Temp High Shear, and have more anti-wear additives when compared to the regular oils. There is an M1 5W-30 High Mileage oil. Some people run them just because they're more robust.

Thanks for all the info! I guess I'll be sticking with my mobil1 5w30 and 5000km change interval since weight is not a big factor. Never seen HM 5w30 Mobil1. I'll have to check that out.

Regarding all the leak comments, I did have an oil leak but had the PCV valve and seals replaced so everything is better now.

Thanks again!
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