oil weight?
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,379
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From: midwest
oil weight?
the owners manual for a 2005 jeep wrangler with a 4.0l straight 6 recommends 10w30 for all temps till 0 degress and 5w30 from anthing below 0 to only 32 degrees...shouldnt the 5w30 work in temps higher than 32 and be the same as 10w30 at operating temp??? also can i mix one qt of 10w30 with 5 qts of 5w30?
Postmaster
Joined: Nov 2008
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From: BC Canada
5w30 just flows eaier, hence faster when its cold out, and gets oil to the parts that need it quicker.
Also makes the engine crank over easier when its cold out.
I see no reason to not just run 5w30 oil year round.
Also makes the engine crank over easier when its cold out.
I see no reason to not just run 5w30 oil year round.
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From: Ohio
Bingo! Nail hit on the head
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Yes, a 5W-30 will still be a 30 weight when warm. Here's the only thing I have against using a 5W-30 if I don't have to.
A 5W-30 has more viscosity improvers (or something) added to it to allow a thinner weight when cold, and still be a 30 weight when warm. The bad thing about them is that they shear down easier. A 5W-30 will be thinner when warm after 3 or 4000 miles compared to a 10W-30. I prefer a 5W-30 when it's going to be 40 and below all the time... otherwise, it's 10W-30 for me.
Synthetic is another story. No point in running a 10W-30 synthetic. Synthetics are much tougher to shear. So, when running a synthetic, a 0W-30 is the best way to go, or a 5W-30.
A 5W-30 has more viscosity improvers (or something) added to it to allow a thinner weight when cold, and still be a 30 weight when warm. The bad thing about them is that they shear down easier. A 5W-30 will be thinner when warm after 3 or 4000 miles compared to a 10W-30. I prefer a 5W-30 when it's going to be 40 and below all the time... otherwise, it's 10W-30 for me.
Synthetic is another story. No point in running a 10W-30 synthetic. Synthetics are much tougher to shear. So, when running a synthetic, a 0W-30 is the best way to go, or a 5W-30.
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,379
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From: midwest
well i just changed it and used Quaker State 5w30 which i feel more comfortable in the winter...there have been some below zero days already and it takes a bit longer to build oil pressure so it should be better now...i think ive always used QS 10w30 and changed every 3k mi
i knew there had to be some disadvantage of 5w30 or else why use 10w30 at all
i knew there had to be some disadvantage of 5w30 or else why use 10w30 at all
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Joined: Jan 2006
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From: Streamwood,IL
Your newer engines have tighter tolerances than the older engines did, thats why mfgs. are going with the lighter weights-ie..my new 2007 Escape requires 5w20 syn blend all year (which it will get to keep my extended warranty good), and the "tech" on oil, and engines, and engine life is better than its ever been in the past..Years back I used nothin' but Quaker State, but now with the price of oil, lets just say I found something I feel comfortable using...
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Castrol Syntec 0W-30 (AKA German Castrol) is thicker than both the 5W and 10W-30 M1. BTW, yes, I love GC's properties.
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