The V8 Owners Forum -

hi marki,
cheers for that mate,
i may stick with the lucas 20w/50 race oil i have been using for the past 3 years then m8 and also add the zinc additive.

Just double check the temp charts M8 but I don't think I am far away.

what for the 4.6 engine at the motor factors?

maybe someone can look in their rave manual and post what it is? I don't have access to mine at the mo

no takers so far,

im going to get some cheap 15/40 to run the engine in tomorrow.,
if in the meantime someone finds the oil specs chart for the 4.6 (temp ranger)
can you let me know before i go and order a case of oil please,

Rave Says

Serp Engine

Use oils to API service level SG,SG or SJ or ILSAC GF2 or ACEA A2:96

0 to 50+ degrees C

15/40 or 15/50 or 20/40 or 20/50


and for Classic

Oils must meet:
RES.22.OL.G-4 or CCMC G-4 or API SG or SH

-10 to 50+ degrees C

15/40
15/50

0 to 50+ degrees C

20/40
20/50

Speak to Millers. They also do a specific running in oil.

cheers Reg
so i got a few to choose from

had a delivery from Lucas today,
4x5ltr 20/50 fully synth racing oil,
and a bottle of zinc additive,, £136.00
once the ole gal has done the 1000 miles (not long now)
will pop the oil i raced the 3.9 on in and see how she likes that,
i did ask regarding the crank driven pump and Lucas also said use the 20/50 fully synth if racing,

I've only ever used Halfords 20/50 classic in all my Rover V8's.

i used 20/50 all the time mate,
but with the crank driven pump been a few opinions on what to use,
thus why i asked Lucas, what to use with the later style pump,
and they recomended 20/50 again due to racing and using on the road,

Just looking at what oil viscocity to use for my re-build 4.6 with crank oil pump.

You all generally seem to use 20w/50.

I can understand why you'd use a 50, if you maybe have a tuned engine and will run higher oil temps above 100 degs, or live in a hot climate.

Just trying to understand why you'd use a 20w. for cold starting?

The viscostiy is over twice a 10w at 0degC. If a 50 is thick enough at 100degC (18cst) then

The table below shows oil viscosity at certain temps:
Grade 0degC 10degC 40degC 100degC
5w-40 842 430 91 14
10w40 874 440 91 14
20w-50 2300 1013 157 18

Perhaps i'm missing something?

I was thinking buying a cheap 10w-40 for running in then using a good quality 5w-40.

What do you think?

Tom.

20/50 is what is used in the older engines or engines with the cam driven oil pump as they wont pump the thinner oil as well unless they are in top condition. You can get 10/50 5/50 but its expensive and fully synthetic. These are also old design engines with a lot bigger clearances (even the last 4.6) than modern engines so the thicker oil isn't such a problem in fact it could be argued its a benefit. You pays your money at takes your chances. There are probably more oil related posts on this and other car forums than any other posts.

I dont have any problems with my dissy driven pump!
I know the crank driven pump will be better as it does not strain the dissy drive. But is it any better for lubrication? Does it flow any better at low pressure?
Apart from the issue of strain on the dissy drive, what are the benefits of the crank pump?

A big advantage of a crank driven pump is it runs twice as fast as a cam driven pump, this means starts producing pressure at half the engine revs of the cam driven pump, where the pump over comes leakage back past the pump body and actually pumps oil to the bearings. Also as it is spinning twice as fast it can be made phisically smaller, at low revs it will be using less power to drive it (though more at high revs) but as most engines spend most of their time in the lower rev range then in theory it is more efficient.
Best regards
a very boring person.