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dog321fish

10/40 or 5/30 Engine oil.

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Hi

I think i have asked this question before but can not find the answer.

My 1982 1.8s Berlinetta is usually on the road for the summer months only, is it OK to use 5/30 engine oil or is it beneficial to use 10/40 ? 

 

Thanks

 

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10/40! That oil is not as fluid as 5/30. You use the car in the summer, so the temperatures are higher; an engine of 1982 will 

have some mileage so 10/40 will keep the oil pressure higher.

We use 5/30 on new engines, the fabrication-tolerances are these days higher than in 1982.

 

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10/40 in the old 1.8. 

Where abouts in sunny North Wales are you? I'm just outside Mold, not for from Wrexham. 

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Was going to put 20/50 in my ‘79 Cav - have things moved on from that now then?

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My Carlton from the same era has 15/40, IIRC i was putting 20/40 in CIH engines.

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1 minute ago, MANTAMAN said:

My Carlton from the same era has 15/40, IIRC i was putting 20/40 in CIH engines.

Thanks Mantaman, much appreciated.

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It depends on the condition of the engine really i wouldnt personally go any thinner than 10w/xx for cold starting and xx/40 should be fine providing the oil pressure when hot doesnt drop below 0.5 bar at idle otherwise xx/50.   

So thats 10w/40.          15w/40.     20w/50

not quite sure about 20w/40 never used it in a car ,thought it was motorcycle oil but if its good mineral oil cant see any reason not ?

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1 hour ago, rutts said:

Valvoline racing oil in a cih. Bit expensive but worth every pound. 

 

 

Like how you said every pound not every penny..

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