Mike7777777

Member

• Dec 10, 2017

• #1

I have a pre-serp V8 in a Rangie, it's normally a good starter, however it's become a lot slower to turn over in the current 0'C temperatures. I'm using Valvoline VR1 20w50, I have previously tried 10w40 but the oil pressure light would flash at idle when hot, so I want to use an oil that ends in "50", however it is possible that "20W" is too thick in freezing conditions at start up.

Has anyone used Penrite 10w50 or 15w50 semi-synthetic motorcycle oil (ZDDP 1200+ ppm) ?

 

neilly

Well-Known Member

• Dec 10, 2017

• #2

Hi Mike,

You may be better off putting this question in either the Rangie section or the ina specific engine section. Otherwise it will quickly get lost in the engine forum.

Cheers

 

Mike7777777

Member

• Dec 12, 2017

• #3

Thanks, I thought I'd posted this in the V8 sub-forum, but apparently not.

 

R

Ratae

Well-Known Member

• Dec 13, 2017

• #4

Battery fully charged?
Earth leads in good order?
Mine's a 3.5EFi & is on mineral 15w/40. No starting issues.
Isn't synth & semi-synth a bit thin for the V8s?

 

norseman

Well-Known Member

• Dec 13, 2017

• #5

Ratae said:

Isn't synth & semi-synth a bit thin for the V8s?

Click to expand...

Yes it is, the design of these engines dates from the 'sixties, the oil pumps are hardly hi-tech & thrive on mineral oil.
I run my 3.5efi on Valvoline VR1 20w/50 or Millers Classic 20w/50 both having zddp of 1200 ppm & I don't have a cold weather cranking problem despite having a standard spec. battery & the car often being unused for a fortnight.

 

cooltide

sheep fancier

• Dec 13, 2017

• #6

Can't see the oil pump slowing the cranking down that much. 10w 40 isn't ideal but within the range given in the manual, so I'd say get your oil pressure checked.

 

discool

Well-Known Member

• Dec 13, 2017

• #7

Grade wise they are the same oil SAE 50 I don't remember any issues using 20w 50 in the winter with my 3.5 RR or any cars before that. My 3.9 disco runs with 10w 40 always has done, still with out issues, it's basically the same engine.

 

Mike7777777

Member

• Dec 15, 2017

• #8

Thanks for the replies, I'll give the 10w50 a spin. Cold starting has improved over the last couple of days, but then it has got warmer!

 

tsav58

Member

• Dec 21, 2017

• #9

id personally go for a 20w50 as the v8s are an older type engine and have more tolerance then modern high tech v8's

 

wooly123

Active Member

• Dec 23, 2017

• #10

i all ways use the 20/50 valvoline,1996 4.6 hse,my personal preference of course.

 

listerdiesel

Well-Known Member

Events Planner

• Jan 18, 2018

• #11

10W-40 or 15W-40 in diesel oil in our Thor V8's.

Peter