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oil following new rings

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Old Oct 30th, 2017, 15:49   #1
osullivant
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Default oil following new rings

I just fitted new rings, cylinders honed, engine nearly ready for trial.... question. some sites suggest use of mineral oil for the first few runs to promote seating/ runningin the rings..?

myth? daft? necessary?
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Old Oct 31st, 2017, 07:31   #2
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Quote:
Originally Posted by osullivant View Post
I just fitted new rings, cylinders honed, engine nearly ready for trial.... question. some sites suggest use of mineral oil for the first few runs to promote seating/ runningin the rings..?

myth? daft? necessary?
Depends if the parts fitted were Volvo or German OEM standard. If not I would do the first 1K with a special run in oil.

Not sure what the Haynes book of lies or a Volvo stealer would say, but for many modern engines OEM oil is OK if you keep the revs to half redline max for the first OCI. It also helps to try and avoid too much time at idle.

The mineral oil myth is from the old days when you needed some Carbon deposits or even sludge to seal up a new rebuilds gaskets etc. So they used cheaper non detergent oils that often had high levels of Zinc and Moly based additives. Castrol Edge of Shell Helix (A3/B4) have plenty of both.
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Old Oct 31st, 2017, 08:40   #3
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Look at it this way - with new Volvo engines the come filled with the same oil that is used throughout their life and it’s not changed until 18k. Hence I would suggest it is a matter of personal preference.

The issue with mineral oil is that it decomposes at high temperatures and leaves deposits which can block oilways. This was generally only an issue on turbocharged petrol engines though.

However I did once rebuild an engine in an Triumph Spitfire, which even after 4000 miles felt “tight”. I had been using Agip Sint2000 which was a fully synthetic oil, I put the cheapest mineral oil in that my local factor sold and after 500-1000 miles it felt much looser and mpg went up.

That however is very old tech, I would be reluctant to do that in a modern turbo diesel, but it may explain where the suggestion came from.
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Old Oct 31st, 2017, 15:46   #4
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Oh noes! You should never ever run any classic car on synthetic oil, only use a good quality 20/50. You can still get it as it's marketed as classic motor oil.
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