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  #37  
Old 01-30-2010, 12:32 PM
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Re: what brand oil does everyone use?

Quote:
Originally Posted by rwilson8272 View Post
7qt M1 5w-20 & Mopar filter every 3500mi

Can anyone explain the why it's ok to run synthetic oil for >4000mi?
I understand synthetic oil is less susceptible to thermal breakdown. What I don't get is the dirty aspect? My oil is nasty @ 3000mi.
Dirty oil is a function of the filter efficiency. While I was in warranty, the MOPAR filter / dealer oil would start to get dirty about 3.5K miles and be black by 5K miles.

Generally, oil does not break down that fast, but the additive package may. Synthetic oil is a more consistent makeup so the effect of any breakdown has less overall effect. However, I am not expert in tribology and learned this oiver the years. Sea story: I spoke with an Exxon port engineer who never changed the oil in his new (at that time) Lincoln Continental. What he did do was change the oil every 3K miles and add a quart of fresh oil. He analyzed the oil that came out at every filter change and claimed to have no engine wear indications after 75K miles. Then again, he had free access to an oil analysis lab..............

HEMI is now on its first run with a K&N filter and 5W-20 Castrol Syntec full synthetric oil at about 4K miles since the oil change. Checked oil level this morning and it appears cleaner than before. HEMI tick is greatly diminished. Will need to wait for next oil change to verify initial indications.

If you change oil/filter within the Jeep requirements, it probably doesn't really make too much difference.

The greatest engine wear occurs at startup anyway and more specifically during cold starts. If your driving involves lots of short trips and frequent engine stop/start, it's probably where most of your engine wear would come anyway. Using an oil filter with integral backflow preventer (i.e., check valve) keeps the oil higher in the system and minimizes the time for the oil pressure to reach the upper oil galleries and valve train.

Stationary diesels and marine diesel have a heater and pre-lube pump to prevent this startup wear (until the engine-driven lube oil pump builds up discharge pressure). This setup would be impractical on a car engine.
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  #38  
Old 11-15-2011, 12:43 AM
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Re: what brand oil does everyone use?

I am currently using a 5/20 synthetic blend.
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  #39  
Old 11-15-2011, 05:54 AM
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Re: what brand oil does everyone use?

Royal Purple 5w-20 and K&N filter. Filter change every 5k, full oil change at 10k.
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  #40  
Old 11-15-2011, 08:38 AM
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Re: what brand oil does everyone use?

Amsoil European formula, every 12,000 km and a Mann filter.
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  #41  
Old 11-15-2011, 09:50 AM
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Re: what brand oil does everyone use?

Moble 1 full syn for me
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  #42  
Old 02-26-2012, 09:34 PM
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Re: what brand oil does everyone use?

Im using Mobil 1 synthetic 5W-20 and I just changed it after a little over 6000 miles. I got there in about 4.5 months because I've been driving a lot lately. Going forward I don't plan on getting to 6000 miles that quick. What do you suggest for a duration interval using this oil?

??? months/6,000 miles
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  #43  
Old 02-27-2012, 09:37 AM
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Re: what brand oil does everyone use?

I use Royal Purple for everything. Such amazing anti-friction properties.
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  #44  
Old 02-27-2012, 01:43 PM
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Re: what brand oil does everyone use?

5w30 penzoil out of the gun at work and a mopar filter @ 3k miles.
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  #45  
Old 03-02-2012, 12:58 AM
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Re: what brand oil does everyone use?

I use Royal Purple 5w-20 and K&N oil filter.
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  #46  
Old 03-02-2012, 06:42 PM
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Re: what brand oil does everyone use?

AMSOIL and AMSOIL filter or wix filter. AMSOIL full synthetic has a 25,000 mile or 1 year lifespan. I don't really have the guts to test it out lol but it is guaranteed on the bottle. and they had been rated #1
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  #47  
Old 03-04-2012, 06:44 PM
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Re: what brand oil does everyone use?

Quote:
Originally Posted by psiewert View Post
I use Royal Purple for everything. Such amazing anti-friction properties.

Royal Purple is the only oil that uses molybdenum disulfide, which is a good lubricant, but the moly particles can come out of suspension, and it agglomerates, can clog filters, and settle in oil pans. That is why no other oil company uses it. The viscosity with RP is actually poor in comparison tests, as is the volatility rate and the wear properties. A lot of marketing BS in other words. SImlar to Z-max who makes a lot of claims and were recently sued by the FTC for false advertising, as it not only does nothing, it acutally dobules the bearing corrosion versus not using it. Analysis shows z max is primarily mineral oil.
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  #48  
Old 03-12-2012, 05:28 PM
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Re: what brand oil does everyone use?

Mobil 1 oil (5W20) & filter
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