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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Amazon (B20) engine oil - SAE 10w30 or 20w50?

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Old Oct 30th, 2018, 12:40   #21
BLS07
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Originally Posted by c1800 View Post
Wow, there’s so many threads on multiple forums about oil. These 60’s engines require a reasonable level of zinc and phosphorus, somewhere around 1200 to 1300 ppm. Modern oils don’t have levels that high due to catalytic fouling. Do your research and the answer will be apparent. 10w30 vs 10w40 vs 20w50 depends on ambient temps. I.e. summer 20w50, winter 10 or 5 w 40 or 30. Depends on how cold it gets.

p.s. indiscriminate use of ZDDP additive can result in levels too high which will result in accelerated wear of cams.
Roger that, thank you c1800.
London winter looks promisingly cold this year.
She got through last winter no issue - problem is seller didn't respond with what 'ruddy oil they had running through her veins.
Thanks again
BLS07
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Old Oct 30th, 2018, 12:51   #22
BLS07
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Hi Dibble,

Yep - I know of Irv Gordon too.
Amazing that the original camshaft, for example, is not worn outside of allowable range -- at all. Incredible really.

Castrol GTX 10w30 (manual's viscosity spec) was the first choice I had/have.
Just can't find that.

I understand the more resistant it is to thinning, then the higher the second number (10W-40 versus 10W-30, for example). Ultimately my understanding is that is a good thing, right ?..
Because within reason, thicker oil generally seals better and maintains a better film of lubrication between moving parts.

I guess cold climes such as Scotland would make 20w50 about perfect in that case?
..London winter is some-may-say 'softer' (unless coastal..anyway that's a debate for another day)
..so thinking the 10w40 Fuchs or similar be the goods!

Cheers
BLS07
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Old Oct 30th, 2018, 13:09   #23
AndyV7o
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Quote:
Originally Posted by c1800 View Post
Wow, there’s so many threads on multiple forums about oil. These 60’s engines require a reasonable level of zinc and phosphorus, somewhere around 1200 to 1300 ppm. Modern oils don’t have levels that high due to catalytic fouling. Do your research and the answer will be apparent. 10w30 vs 10w40 vs 20w50 depends on ambient temps. I.e. summer 20w50, winter 10 or 5 w 40 or 30. Depends on how cold it gets.

p.s. indiscriminate use of ZDDP additive can result in levels too high which will result in accelerated wear of cams.
Yer on the right track by and large...
It isnt just ambeint temps, its the internal oil galleries, bearing clearances, oil pump etc which also govern the viscosity.
Zddp needs to be in the 800-1300 range, though classic oils ought to be 1000-1300 range. Yes, too much isnt good. Some modern oils still contain over 1200 zddp, which is generally those which are API SL rated as a mild rule of thumb. Some C spec oils contain 800 which is sufficient, A/B spec oils usually contain in the 1000-1100 region. IIRC, off the top of my head, at work...
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Old Oct 30th, 2018, 13:17   #24
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Originally Posted by BLS07 View Post
Hi Dibble,

Yep - I know of Irv Gordon too.
Amazing that the original camshaft, for example, is not worn outside of allowable range -- at all. Incredible really.

Castrol GTX 10w30 (manual's viscosity spec) was the first choice I had/have.
Just can't find that.

I understand the more resistant it is to thinning, then the higher the second number (10W-40 versus 10W-30, for example). Ultimately my understanding is that is a good thing, right ?..
Because within reason, thicker oil generally seals better and maintains a better film of lubrication between moving parts.

I guess cold climes such as Scotland would make 20w50 about perfect in that case?
..London winter is some-may-say 'softer' (unless coastal..anyway that's a debate for another day)
..so thinking the 10w40 Fuchs or similar be the goods!

Cheers
BLS07

Cold climates need thinner oil. It isnt quite as simple as the viscosity numbers, but by and large. See here regarding hths and other technical stuff, https://www.volvoforums.org.uk/showthread.php?t=283503 I made an oil thread to try and prevent threads like this getting clogged up with waffle! 20w50 would be ratger inappropriate for an enigine built around 10w30.
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