TOO HEAVY

Messages
4,632
Location
Decatur AL USA
quote:
Originally posted by mgm13: My brother just put 6qts of Mobil 1 15w50 in his 2000 GM 5.3. 70,000 miles no noise no usage no problems on Mobil1 10w30. Deep S Texas 100+. Question is what will this do to his engine and whats the best fix short of dumping $24 worth of new oil? Help pls.
LS1 based motors (4800, 5300, LS1, LS6, 6000) like thick oil. Many here use a blend of Mobil 1 15W-50 and 10W30. He will likely have a slight mpg lose 1-2% peak bhp from the pumping and windage losses. My suggestion? Run it 7500 mi or until lows get below 40F (4.4C). Gene
 
Messages
4,478
Location
Southern California
quote:
Originally posted by MAJA: Also, whats with the Tech's A$$ comment?
Easy, Tex - my daughter, an alum of Texas A&M, is a Tex-A$$ resident, too, and enjoys the kidding. Besides, our governor will come beat your governor up if you're not carefull! [Cheers!] A Lone-Star state of mind...
 
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2,768
Location
Tn
He should be fine. I'd just run it out to a normal oci. Your location and the fact that it's Summer make it a non- issue. Not to worry. [Big Grin]
 
Messages
13,132
Location
By Detroit
quote:
Originally posted by mgm13: My brother just put 6qts of Mobil 1 15w50 in his 2000 GM 5.3. 70,000 miles no noise no usage no problems on Mobil1 10w30. Deep S Texas 100+. Question is what will this do to his engine and whats the best fix short of dumping $24 worth of new oil? Help pls.
Could be worse. He could have put 5w20 in it! [Big Grin] But seriously, if he has an oil pressure gauge and it is not above spec hot pressure, not to worry. If he wants to back off, drain two quarts and replace with 5w30 and he will be fine. But save the two drained quarts for near future use.
 
Messages
47,786
Location
Everson WA - Pacific NW USA
[Off Topic!] maja - I was being facetious about the cold in S. Texas. I was in San Marcos on the hottest day on record there. Right before that I was in Houston. I can't stand the heat....The Techsass thing is nothing personal.
 
Messages
656
Location
Massachusetts
Your brother may find out that the truck runs smoother and likes the heavy oil in the summer better. Somebody here mentioned that the add package is just a tiny bit beefier with the 15w-50 too. I wish I made mistakes like that!!!
 
Messages
11,284
Location
Spring HIll
With M1 15w-50, he'll be fine. I put it my car this summer, and last summer come to think of it. No noticeable difference in MPG whatsoever (it's an old 4-banger Saturn). M1's 15w-50 product is good stuff.
 
Messages
264
Location
Rio Grande Valley
My brother just put 6qts of Mobil 1 15w50 in his 2000 GM 5.3. 70,000 miles no noise no usage no problems on Mobil1 10w30. Deep S Texas 100+. Question is what will this do to his engine and whats the best fix short of dumping $24 worth of new oil? Help pls.
 
Messages
47,786
Location
Everson WA - Pacific NW USA
I fail to see the issue here. Sure a 10W-30 will probably flow better on those cold mornings and the 15W-50 isn't specically in the manual, but we are talking Tech's a$$ summer and synthetic oil....not an issue.
 
Messages
542
Location
South Central Texas
I am assuming he put 15W-50 in instead of 10W-30, by mistake, right? There should be no problems here at all. In fact, I would probably prefer to use it instead of the 10W-30, as I am not much further north of you. And Pablo, the Rio Grande valley has no cold mornings. Also, whats with the Tech's A$$ comment?
 
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