10W-30 High Mileage
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5w40 Summer, 0w40 Winter.
There is more oil chain engineering to give you a larger viscosity spread.
Personally, I run random blends of 5-30, 10-30 and 15-50 in Extended Performance oils only based upon sales prices I see. I found 5qt 15-50EP containers for $18 and bought 'em all at the store. After this last change I'm now out and blended in some 5-30EP.
As an aside, the yearly drain then gets put into my Ford commuter car that runs like a top at ~230k miles...
After having my oil analyzed a few times on my Subaru (ej25 turbo) I run rotella synthetic 5w-40 in it and all my other vehicles. It holds up well for 6000 miles in the subaru and i plan on running it for 10000 miles, or one change a year in the land cruiser. It held up better than mobil 1, castrol, or penzoil, and as well as redline and royal purple for less than half the price.
Can you post some analysis #s between the brands that you've mentioned, I would be very curious to compare.
Thanks,
60W????
edit: here are the results. sorry for the format.
This was the analysis for my 2005 subaru legacy gt. I know its not a land cruiser, but it's a good example of the protection that the rotella provides, and I haven't had any analysis done on my cruiser yet. Sorry for mentioning castrol, but i guess i never got an analysis on that oil. I ran the GC 0-30 in it once, but couldn't find it anymore.
Oil: Pennzoil Platinum 5w30, 3600 miles on it car at 47k
Filter: PureOne Al 3 Chromium 0 Iron 6 Copper 27 Lead 1 Tin 0 Moly 55 Nickel 1 Manganese 1 Silver 2 Titanium 0 Boron 27 Silicon 11 Sodium 5 Calcium 2797 Magnesium 24 Phosphorous 594 Zinc 681 SUS Visc: 58.9 cST Visc: 9.90 Flashpoint: 375
I didn't run a TBN or TAN this was the first analysis I ran after I bought the car at 40k. I attributed the silicon to the K&K filter. The copper and silver were my main concerns. The only bearings that I am aware of in the engine with silver compounds are the turbo.
Oil: Mobil1 10-30 synthetic, 4000 miles on oil. car at 51k
Filter: K&N Al 4 Chromium 0 Iron 8 Copper 25 Lead 1 Tin 0 Moly 48 Nickel 1 Manganese 1 Silver 1 Titanium 0 Boron 25 Silicon 9 Sodium 5 Calcium 3447 Magnesium 23 Phosphorus 660 Zinc 730 SUS Visc: 55.2 CST Visc 9.3 Flashpoint 360
I was glad to see the silicon go down, but the copper and silver were still concerns. Also the viscosity and flashpoint were lower than I want.
Oil: Royal Purple 5-30, 4000 miles on oil. car at 55k
Filter: Pure1 Al 3 Chromium 1 Iron 8 Copper 6 Lead 0 Tin 0 Moly 74 Nickel 0 Manganese 0 Silver 0 Titanium 0 Boron 10 Silicon 10 Sodium 7 Calcium 1883 Magnesium 241 Phosphorus 684 Zinc 826 SUS Visc 54.1 cST Visc 8.5 Flashpoint 355
The royal purple had the copper and silver where I want them, but the oil seemed to be shearing down far ahead of my expected life span (I was hoping for 8-10k runs on this oil). No doubt a good oil but IMHO not worth the price.
I can't find my analysis for the redline oil, but IIRC it was mostly the same as the royal purple. A good oil but didn't have the longevity I was hoping for.
Oil: Shell Rotells T SYN 5-40, 4000 miles on oil, car at 77k (my second change with this oil)
Filter: Pure1 Al 2 Chromium 1 Iron 6 Copper 3 Lead 1 Tin 0 Moly 65 Nickel 0 Manganese 0 Silver 0 Titanium 0 Boron 22 Silicon 6 Sodium 9 Calcium 984 Magnesium 84 Phosphorus 655 Zinc 784 SUS Visc 70.2 cST Visc 13.08 Flashpoint 405
I was just thrilled by this analysis and promptly decided that this is the oil for me. Still going strong at 4k I plan on doing an analysis at 6k to see if that’s an acceptable interval. I also modified and tuned my car from 180 wheel hp to 230 whp before this interval.