I think you might be right.
I think you might be right.
Marshall8hp
Well-Known Member
I have a 4cyl Landrover. It drinks 20W/50 like beer, to the tune of about a litre to a tank of fuel. I started using Penrite 40W/70 and it will now do 5,000km with a litre top up on the way through. Viscosity makes a huge difference to consumption, especially if you have an older engine with worn valve guides etc.
I appreciate the contribution David, I had no idea oil viscosity could make such a difference.
Simon
Henry_b
Think outside, no box required.
Marshall8hp
Well-Known Member
Its good stuff! Being Penrite it is also very high quality oil.
ifloochies
Well-Known Member
You're just a few centistokes shy of gear oil.
Oil that thick must not be doing your oil pump drive any favours, and if its turbocharged, your turbo must certainly not appreciate the late deliveries of lubricant when the engine is started up from cold.
Marshall8hp
Well-Known Member
1981 4cyl Landrover engine is as close to a 1950s tractor engine that you can get without actually being one.
Density at 15°C, kg/L 0.881
Viscosity, Kinematic, cSt at 40°C 325
Viscosity, Kinematic, cSt at 100°C 31.2
Viscosity Index 133
Cold Cranking Viscosity, cP at -10°C 8166
Ca content, Mass % 0.176
Zinc, Mass % 0.145
Phosphorus, Mass % 0.132
Sulphated Ash, Mass % 0.85
Total Base Number (TBN) 5.8
Density at 15°C, kg/L 0.881
Viscosity, Kinematic, cSt at 40°C 325
Viscosity, Kinematic, cSt at 100°C 31.2
Viscosity Index 133
Cold Cranking Viscosity, cP at -10°C 8166
Ca content, Mass % 0.176
Zinc, Mass % 0.145
Phosphorus, Mass % 0.132
Sulphated Ash, Mass % 0.85
Total Base Number (TBN) 5.8
tomcat59alan
Well-Known Member
Henry_b
Think outside, no box required.
A viscosity index of 133 is appalling for an oil by todays standards, even a comma 10w40 you can pick up for £17 a gallon has a VI above 150..
As said 40w70 isn't doing your oil pump any favours, especially since we're approaching winter weather.
Interceptorxj
Well-Known Member
Hocus pocus; magic oil that fixes leaks / engine wear!
Marshall8hp
Well-Known Member
So I guess Castrol GTX 20W/50 (VI 119) and Valvoline XLD 20W/50 (VI 132) are also appalling by today's standards and should be avoided?
Henry_b
Think outside, no box required.
Compared to a modern day Full synthetic 20w50 or 10w50 yes..
Castrol with a Vi of 119 is even worse
