In article ,
Jim at the Common Riding wrote:
what are the real world problems on switching between the recommended 5w
30 synth blend oil and 10w 40 mineral oil in a car? I want to use up a
load of 10w 40 mineral oil in it. What is likely to go?...Bearing in
mind it will only be used for six months in the summer.

Unless it's a cutting edge design, you'll likely be fine. Just half the
recommended oil change interval.

--
*Indian Driver - Smoke signals only*

Dave Plowman London SW
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