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06 v6 SRX
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491 Posts
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My 06,V6 AWD , 90k miles was up to 1-quart every 1k miles . Has never leaked 1 drop or shown any sign from the tail pipe. So the last oil change I went with Mobil 1 10w -30w. On that first 2k miles I did'nt need to add a quart till 1500 miles . That small changed improved mileage by 500 miles . I've always felt 5w oil might work well in a new engine but high mileage engines need 10w or beter . I will keep track of this and report back with any information . Tim
 

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'08 SRX V6
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542 Posts
Sure sounds like sound reasoning. Synthetic oil is sooo thin compared to conventional. My Corvette calls for 5-30 but states 10-30 is also approved - so that's what I use in it down here in hot Texas. I know the new engines are machined for the super thin oils, but it would seem logical that as they age, or if they burn some oil, a slightly thicker blend might be a good idea.

DG
 

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Cadillac
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148 Posts
GM has put out a TSB on oil consumption and recommends basically an engine overhaul, costing them a few grand, this sound a hell of a lot cheaper.
 

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2010 CTS AWD Wagon 2010 BMW X5 35D 2008 GL320
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2,623 Posts
Please correct me if im wrong but does a 5w30 and 10w30 both end up being a 30 weight when hot so it would not matter but for the first 10 minutes of driving?

If you see it or not the car is burning oil or at least blowing it out the exhaust one way or another so maybe try a 5w40 or 5w50.
 

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2007 SRX4 N*, 2004 Infinity G35 Coupe
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Please correct me if im wrong but does a 5w30 and 10w30 both end up being a 30 weight when hot so it would not matter but for the first 10 minutes of driving?

If you see it or not the car is burning oil or at least blowing it out the exhaust one way or another so maybe try a 5w40 or 5w50.
The SRX calls for 5-30 weight GM or GM-approved synthetic. The listed synthetic viscosities are what they are and don't change with temperatures, a major advantage of the synthetics over conventionals. The first number is the thin viscosity potion of the blend for initial or cold weather starts. Combined with the superior adherence (to engine parts) qualities of the synthetics, you should be good to go.

Changing from a 5-30 weight motor oil to a 10-30 blend in my non-professional mind should have had a minor impact on improving the mileage interval between having to add a quart. Changing to a 5-40 and thereby bumping the high temperature portion of the blend where most of your driving takes place.... perhaps. I do know with my Corvette running at full hot operating temperatures I could see an increase in the oil pressure at say 2000-3000 rpm with a change up to the -40 weight oil.

Wouldn't the thicker portion of the -40 part of the blend have a more difficult time getting past the oil rings and valve guides and burning off?

Where is an automobile engine engineer on this forum when you need him?:confused:
 

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2010 CTS AWD Wagon 2010 BMW X5 35D 2008 GL320
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You sort of echoed what I said, a thinner cold oil will do little to nothing for the oil usage issues IMO

Wow a forum member agreed with me, that is like twice now I think.
 

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2010 CTS AWD Wagon 2010 BMW X5 35D 2008 GL320
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You sort of echoed what I said, a thinner cold oil will do little to nothing for the oil usage issues IMO

Wow a forum member agreed with me, that is like twice now I think.
 

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2007 SRX4 N*, 2004 Infinity G35 Coupe
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2,005 Posts
You sort of echoed what I said, a thinner cold oil will do little to nothing for the oil usage issues IMO

Wow a forum member agreed with me, that is like twice now I think.
CONE...........I disagree with you. I always agree with you. :confused: :D
 
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