OVERKILL
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Doesn't surprise me at all, you use very thin base oils to formulate a lot of these thinner grades, they are going to be more prone to coking and deposit build-up.
Main Reasons for Valvoline R&P Popularity : Extended OCI’s + Low Tension Rings ?
- Thread starter ChrisD46
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Interesting.
I am not questioning you, curious why thinner oils are more prone to contributing to deposits?
OVERKILL
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Because thinner base oils are more volatile. It's the same reason the super thin Japanese grades were originally exempt from Noack testing.
In API SP, the TEOST 33C deposit test, this isn't required for SAE xW-16 and 0W-20.
Sequence VIII, Bearing Weight Loss, is also not required for SAE xW-16.
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Thanks.
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The palette includes carbon formed from the combustion process itself.
Great info. I’ve always suspected such.
Precisely, especially if they aren't on the boutique line of oils to have the better base oils and such. I mean looking back at how thin the new oils now are, I wouldn't hesitate running Redline HP 0w20 or 0w30 in everything. I guess i could live with a stout 20w with a hths of 2.9 in a 0w8-0w16 application.
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They didn't plan very well then. There are millions of engines with low tension rings on the road, that have never had a problem, with no special care of any kind.
I would guess that it usually isn't just the rings. My 2AZ-FE Toyota has the oil return holes in the pistons bored too small so once they clog up (pretty easily) the rings are doomed.
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Right next to Wind Turbines and Solar.
https://media.tenor.com/DZaBWjOzzOQAAAAM/had-your-chance-you-had-your-chance.gif
my 2008 Prius has them and it's got 300K miles, and the engine has never been opened up. It has oil consumption issues, but VRP is cleaning them up.
OVERKILL
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I love how we are suddenly blaming a technology that has been in use for 40 years and most people didn't have a clue about it until yahoos on Youtube started making hay.
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Other than race engines - not much else out there.
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The first "pattern" of carbon locked rings that I encountered, was not on low tension rings.
That was during the early 80s, on VW diesel engines. That problem was easily blamed on driving habits, and climate.
Inner city, plus northern climate, short trips would lock them tightly in place.
There was added fun sometimes, when the engine would run away and couldn't be switched off, due to blow-by.
Fortunately those pistons could be on the bench within a couple of hours, without breaking a sweat.
That was during the early 80s, on VW diesel engines. That problem was easily blamed on driving habits, and climate.
Inner city, plus northern climate, short trips would lock them tightly in place.
There was added fun sometimes, when the engine would run away and couldn't be switched off, due to blow-by.
Fortunately those pistons could be on the bench within a couple of hours, without breaking a sweat.
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