personal oil consumption test different oils

Joined
Oct 23, 2008
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385
Location
Montreal, canada
Hi guys, I just wanted to share my personal experience with oil consumption or burn-off with different kind of oils (all gm specs 4718m synthetic) with my 2005 cadillac cts with right now 113k on the odometer. The engine is the 3.6l vvt non-DI auto transmission. Each oil has been treated the same (a lot of idling, highway and city driving) since I do almost the same driving pattern to visit customers each 2 months. I drive about 1000 to 1500 kms per week. I just changed the oil 2100 kms ago with M1 5w30 and it still on the full mark, it didn't move. Mobil 1 5w30: 1 qt per 5-6k miles (approx. 8000-9500 kms) Mobil 1 10w30: 1 qt per 600 miles-1k miles (1000-1500 kms) PP 5w30: 1 qt per 2,5k miles approx. (4000 kms) PP 10w30: 1 qt per 2k miles approx. (3000-3400 kms) I have the UOA for the PP 5w30 and the M1 5w30 and it seems that its the same wears with both oil. The only difference is the tbn since I dont add the same amount of oil between oil change with M1 5w30. Is there a reason why my car drinks oil like I drink orange juice with the 10w30 M1 ? I think I'm going to stay with M1 5w30 since I have to add less top-off oil and get approx. the same results. I want to know your opinion with that.
 
Joined
Feb 1, 2009
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8,859
Location
Texas
 Originally Posted By: Spykem4e
Is there a reason why my car drinks oil like I drink orange juice with the 10w30 M1 ? I think I'm going to stay with M1 5w30 since I have to add less top-off oil and get approx. the same results. I want to know your opinion with that.
I've long had a theory that some engines will burn thicker oils faster than thinner oils (the rings don't remove as much thick oil from the cylinder walls on the downstroke), but that big of a difference between two 30-wt oils is really odd. You also show a slightly higher consumption of PP 10w30 than PP 5w30, but certainly not as extreme. I'd be tempted to discard the M1 10w30 measurement as a fluke unless you could repeat it a time or two.
 
Joined
Jan 10, 2008
Messages
4,998
Location
Milwaukee, WI
M1 10w-30 is thinner than 5w-30 at both 40 and 100 degrees celcius. But that variation is wild. I'd discard the M1 10w-30 as well. I wouldn't try it again unless you're really curious.
 
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