Quote:
Originally Posted by Othen
The final part of this jigsaw will be to swap to 20W50 mineral oil when the motor car is serviced in the spring.
:-)
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For your consideration.
If Janet habitually does seasonal oil changes (lighter weight oil in cold weather) or doesn't plan to drive the car in temperatures below 10 C, 20W50 probably works just fine. Once temperatures approach 0 C 20W50 conventional oils get pretty sludge like. That makes starting difficult and although the oil pressure gauge will register lots of pressure on start up, actual oil flow to the bearings is not so great.
I drive my 142 E up to the point that the snow stays so driving in -10C would not be unusual in late October. I run a 5W50 full synthetic year around. The 5W makes cold starts easier and insures good oil flow to the bearings on start up. Full synthetic is more expensive; but, it eliminates the seasonal change and given that I don't drive the car a lot and with a rebuilt engine it does not consume oil, it hasn't been a problem running 2 years between changes. Synthetics have a greater resistance to sludge formation and deposits allowing the extended change interval.