Oil viscosity and warrantee impacts?
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This is a discussion on Oil viscosity and warrantee impacts? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I'm going to be switching my '05 WRX to synthetic oil at 10,000 miles. I'm leaning toward M1 5W-40, because ...

  1. #1
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    Sep 2005
    Madison, WI

    Oil viscosity and warrantee impacts?

    I'm going to be switching my '05 WRX to synthetic oil at 10,000 miles. I'm leaning toward M1 5W-40, because it appears to be M1 Delvac, and it will also work in my Toyota pickup. The service manual does not mention 5W-40 as a recommended viscosity. I am having my oil changed at the dealership unti the warrantee expires, simply to avoid any doubt on their part that I'm keeping up my end of the bargain.

    Is there any reason why I'd have a warrantee issue by using 5W-40?

    Any concerns with the 40 part of 5W-40? I live in Wisconsin, but the car will be garaged overnight with a block heater timed to kick on 2 hours before leaving for work.

    I may opt for M1 5W-30, but I've not been a big fan of how it seems to disappear in an engine.


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  3. #2
    Moderator GV27's Avatar
    Join Date
    Jun 2002
    Green Mountain, Colorado
    I Support ClubWRX
    Should be OK. The little graph in my book was pretty inclonclusive with everything from 5-30 to 20-50 working dependent somewhat on climate.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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