| Author | Message | ||
     Roger Routledge New User Username: ringarolls Post Number: 28 Registered: 10-2015 |
Hi All I changed my engine oil, Comma 20/50 classic, since then I have had tappet noises when starting and continues till the engine is warm. Didn't have this before, can anybody recommend a alternative. Thanks for any information. Roger | ||
| Mark Aldridge Frequent User Username: mark_aldridge Post Number: 847 Registered: 10-2008 |
Roger, I use Morris 15w50 in my Shadow and Mulsanne. Mark | ||
| Jeff Martin Frequent User Username: jeff_r_1 Post Number: 497 Registered: 07-2018 |
Roger, what weight of oil did you use before ? Isn't 50 weight oil too thick, are the main and rod bearings in such bad shape that you need 50 weight in there ? Would not 10/30 be a better choice and allow the oil to flow better in the tiny orfices in the lifters ? I use synthetic 10/30 in my MK VI, synthetics are the correct viscosity at room temperature, so if you must use a 50 weight, use synthetic and your lifters should be quiet until the engine warms up. | ||
| Brian Vogel Grand Master Username: guyslp Post Number: 3338 Registered: 06-2009 |
Multi-viscosity motor oils are not "the top viscosity" until they're hot. And hot 50W is "thinner" in an absolute sense than cold at lower numbers, but I don't have a table handy with regard to viscosity based upon oil temperature for a given weight. But 10W30 is in the Owner's Handbook as a perfectly acceptable oil. | ||
| Patrick Lockyer. Grand Master Username: pat_lockyer Post Number: 2576 Registered: 09-2004 |
(perfectly acceptable oil.) OMG 10w30 wow never believe all that is in makers books written years ago. The engines were new then and products have since improved greatly. Semi or fully synthetic oils are the way now IMO 10w-40 nothing less. As for the tappet noise after an oil change I would get a long screw driver placed on the rear hydraulic pump and listen for the noise stopping when pressure builds up! if so maybe a pump spring broken. New oil has the opposite effect with hydraulic tappets. | ||
| Guido Peter Broich New User Username: guido Post Number: 36 Registered: 05-2019 |
I got this strong noise and did two things: first two runs with: added 300ml ATF, run engine, change oil. Better. Didn't hurt. Than rear pump overhaul. Click gone. Got in exchange some leaking from levelling valve first and RAM now ... :D By the way in all my old cars I avoid fully synthetic oil and too thin ones, seatings get looser and too thin oil may not do its job in all points. |
