i had some 5w40 synthetic in my car and then i got really low so i added all i had..pennzoil 10w40. is that really bad to mix them? do i need to drain it all out?
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No not really.. Although its not adviseable to mix up the oil on purpose, if you were simply topping of the level there is nothing to be concerned about. The only time you really need to be concerned is if you live in a climate that has extreme temperatures because the odd quart will affect the performance of the rest of the oil. Like if you were running with 5-30 or 0-30 because you lived in the upper midwest and then you put a quart of 10-40 in it you have made the oil slightly thicker. -
Id do an oil change the next time you get a chance. Not a big deal for short term use.:: PNW Crew ::
'87 325 4dr, '74 2002Comment
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Regardless of the mixing thing, you shouldn't use Penzoil! :)Comment
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It's fine...nothing to worry about with those viscosities."I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj
85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
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it's not the viscosity I'd be concerned about, am I reading you right in that you mixed regular (dino) oil with synthetic?Das ist nicht nur nicht richtig, es ist nicht einmal falsch!Comment
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yea i mixed synthetic and regular(? i guess) its all i had at the time i was reeally low. better mixed than none?Comment
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