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Here we go again! Aluminum is still up, haven't done any work on the clutch with respect to seeing if it is the clutch basket that is causing it. No oil use, no issues otherwise so I will stick with it being a clutch basket. Iron has typically been up, a tad higher this time. My instinct says...

Here you go... 5,345 miles on M1 10w40 4t and this time it held grade solidly in the shared sump ZRX 1200. 12.5:1 pistons added 20,000 mi ago. Previous two OCI's are noted as 20w50 V-Twin and 10w-40 4T. A few notes from me to share with you guys: Oil level had dropped toward the end to the...

Title says it all, compare to the oils in the columns to the right, they are labeled. My main interest was how it compared to Mobil 1 10w40 4T Racing. Recap, put new high compression pistons in 10,000 miles ago, so this OCI started about 5,000 miles after pistons were installed. I see what...

First major oil change since break-in with JE 12.5:1 stock bore pistons. Aluminum is up, the engine had 150 miles on the first oil change after the pistons (Rotella 15w40 T4) then this 4,603 mile OCI on the M1. Hope to see it come down next OCI. My thoughts... Oil stayed in grade even in a...

Picked up some Kohler 5W50 full synthetic on a superb sale at AutoZone this past summer. I’ve read of other folks finding the same deal and stocking up. I cannot find official industry ratings for the oil such as JASO MA, etc. It simply says (paraphrasing) it is suitable/meets requirements for...

Oils are labeled at top of each column, scroll down for UOA's. L to R: Valvoline 10w40 ATV Dino oil Castrol 20w50 4T Dino Rotella T5 15w40 SynBlend Mobil 1 15w50 Syn Delo 400 LE 15w40 Dino Rotella T6 5w40 Syn This ZRX1200 has ZZR1200 cams, higher compression pistons, ZZR Keihin CVK40 carbs...