14-01-2022, 10:15 PM
(This post was last modified: 15-01-2022, 03:54 AM by Bob Culver.)
Running in oil was all the fashion decades ago but now seldom heard of. Major Oz ring and piston manufacturer ACL advises in 2000 catalogue a major oil company 20W50 or 15W40 with first change as soon as poss and not after 300 miles. (customers cars, Oz conditions above freezing, pressure feed))
It probably some coincidence but a very experienced Javelin rebuilder found be shells developed severe wear on running in oil.
Whether running in oils had a lot or no ZDDP I dunno, but a case can be made for either.
The main areas of wear are the rings and the dynamo cross gear if new or disturbed. A low or no charge rate assists.
Seems to me a sump magnet very desirable. Except perhaps for the first change often changed oil can be poured through a filter and reused. I dunno to what extent oils used for cold running are revived by a long hot run. It certainly evaporates condensed fuel and water.
Some of the SAE30s claims to be "classic" which, despite price, would imply no ZDDP or other antiwear, antirust etc additives .
The VW Beetle (at least to 1972) had no filter but 3000 mile changes (and a magnet). Like Porsche, did not trust current multigrades but the then monogrades would have had contemporary additves.
It probably some coincidence but a very experienced Javelin rebuilder found be shells developed severe wear on running in oil.
Whether running in oils had a lot or no ZDDP I dunno, but a case can be made for either.
The main areas of wear are the rings and the dynamo cross gear if new or disturbed. A low or no charge rate assists.
Seems to me a sump magnet very desirable. Except perhaps for the first change often changed oil can be poured through a filter and reused. I dunno to what extent oils used for cold running are revived by a long hot run. It certainly evaporates condensed fuel and water.
Some of the SAE30s claims to be "classic" which, despite price, would imply no ZDDP or other antiwear, antirust etc additives .
The VW Beetle (at least to 1972) had no filter but 3000 mile changes (and a magnet). Like Porsche, did not trust current multigrades but the then monogrades would have had contemporary additves.