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30th November 2019, 09:41 | #11 | |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
Location: Sumweer onat mote o'dust (Sagin)
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Quote:
As for hydraulic tappet noise, I suppose the lower cold viscosity oils will tend to drain from the internal piston more easily than will a standard one. And no doubt over time, the ball valve mechanism will fatigue and more easily lose hydraulic lock. Having removed and dismantled all eight of my inlet side tappets, I noted they can take quite some time to re-establish themselves. As I understand it, the hydraulic tappet treatments (Wynns, etc) are basically oil soluble detergents which promote better 'washing' of the internal valve mechanism. Adding one is a bit like using a diesel engine oil. These are formulated with higher levels of detergent/dispersant additives than typical petrol engine oils. In cases of a stubborn tappet, I found that running for a few hundred miles with a 10w-40 diesel oil is equally equally effective. A further thing to remember after working for a while on any petrol engine is that the canister purge valve will activate shortly after you start the engine. In my experience, this cycle will repeat for quite a while, apparently depending on how saturated the vapour canister gets during the car's layoff. Those unfamiliar with its sound will likely mistake it for a very noisy tappet. TC Last edited by T-Cut; 30th November 2019 at 11:14.. |
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30th November 2019, 15:34 | #12 | |
Avid contributor
Rover 75 saloon Join Date: May 2019
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Would you reckon after using engine flush to use a cheaper oil for a few miles before putting the Mobil 1 in just flush out any remaining sludge and engine flush ? Reagrds Thanos |
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1st December 2019, 10:16 | #13 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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Simon
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