Mobil 1 synthetic oil weight

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

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 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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