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Mobil 1 synthetic oil weight

BIGCEE65

MEMBER
2004 CADILLAC CTS
3.6L
6 CYL
2WD
AUTOMATIC
99,975 MILES

My car calls for 5W30 Mobil 1 synthetic oil, but I think I need a thicker oil based on a slight valve rattle. Would it harm my engine if I switch to 10w30 Mobil Oil synthetic in my car? If that is too thick, can I do a half and half of the 5W30 and 10W30? Thanks for any advice.

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Monday, June 13th, 2016 AT 9:04 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yep you will be okay with 10w30 that's what I use too.

Best, Ken

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Wednesday, June 15th, 2016 AT 8:31 PM

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