Does anyone hear of oils reacting with each other and blocking oilways anymore?

I know this used to be a bad issue with the oil galleries slowly blocking up over time.
I was wondering if this still exists with new oils.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

either way i wouldnt be mixing oil brands.
maybe within an oil brand maybe

trev has penrite classic medium, he started sounding a little loud when warm, so i top up with classic heavy

Audie who sells it to me said its fine

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I think you are pretty safe with mineral oils, I wouldn't mix synthetic oil with it though.
Original Castrol R (castor oil based) had a reputation for blocking things up many years ago if you left it standing too long in a motor, but that stuff was just a race oil. Lovely smell though...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've mixed plenty of oils of the same weight over my time...

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So for instance, you wouldn't swap back and forth using a semi-synthetic oil to a straight mineral oil? Or do you mean full synth to a mineral perhaps?

I've been sticking with Penrite since building this 1275 eight years back, and have had a clean, reliable and easy to keep cool engine.

I would like to try another oil, simply out of curiosity more than anything else but I've seen the results of this when the Navy changed it's oil throughout the fleet a decade or so back. They ended up with gummed up oilways and all kinds of problems resulting from the swapping and mixing of oil in it's big diesels.

I thought maybe it was an issue that might have been sorted by now accross the industry.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

mick stick with what works
makka

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I meant Mineral...I don't use synthetic in the mini..

For instance, the other day i topped up some Castrol Forumla R 20w50 with Valvoline XLD 20w50...since the lovely A-series has started an appetite for oil

Motor's on it's last legs..if it was new, i would prefer not to mix oil, but it certainly does no harm IMO..

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