confused about oil

Nodge68 · Dec 30, 2013

Hippo said:
I put 10w40 Castrol magnetic in ma v6 engine. LR main dealer put 5w30 in when they previously serviced it. I'm sticking with 10w40 CM as I bought loads when it was cheap.

5w30 is to thin for the V6. Iirc it's always needed a semi 10w40 oil.

Thor1950 · Dec 30, 2013

Nodge68 said:
5w30 is to thin for the V6. Iirc it's always needed a semi 10w40 oil.

Your temps are not cold enough for any 5w30,5w40 oils..... Oil also carries heat to be gotten rid of through the oil cooler, 10w what ever carries more heat away than a 5w what ever grade oil

kev1nlm · Dec 30, 2013

Thor1950 said:
Oil also carries heat to be gotten rid of through the oil cooler, 10w what ever carries more heat away than a 5w what ever grade oil

Your referring to its cold temperature viscosity here, I'm not sure what relevance it has to its cooling properties??

jamesmartin · Dec 30, 2013

are you sure, thinner oil cools better in my understanding

Thor1950 · Dec 30, 2013

jamesmartin said:
are you sure, thinner oil cools better in my understanding

Then why do they go to a 50 weight oil in the southwest of the USA in the summer months when the air temps is in the 110F-120F and roads surfaces are in the 200F

kev1nlm · Dec 30, 2013

the oil is only thinner in cool temperatures as soon as the engine is upto to temp it goes up to the higher viscosity, the way the grading system works its possible that you could have an oil with a high 30's grading and one with a low 40's grading meaning they are actually not that far apart viscosity wise

kev1nlm · Dec 30, 2013

PHP:

Thor1950 said:
Then why do they go to a 50 weight oil in the southwest of the USA in the summer months when the air temps is in the 110F-120F and roads surfaces are in the 200F

The W doesn't mean weight it means winter and if you had a 50W oil then it would be very thick in cool weather

jamesmartin · Dec 30, 2013

Thor1950 said:
Then why do they go to a 50 weight oil in the southwest of the USA in the summer months when the air temps is in the 110F-120F and roads surfaces are in the 200F

presumably oil gets too thin in extreme heat ,but id have thought modern cooling systems and synthetics negated that somewhat

Thor1950 · Dec 30, 2013

kev1nlm said:
PHP:

The W doesn't mean weight it means winter and if you had a 50W oil then it would be very thick in cool weather

That is why is said in the summer

In the winter month they drop back to a 30-40w oil

In the winter here 10w30 is the normal and summer months 10w40 which is the same as your temps if not warmer

DTO · Dec 30, 2013

5w-30 fully synthetic is the oil used by landrover when I used to have it serviced by them , I have carried on using that grade of oil on mine . Using 10w-40 semi would be going backwards in time to pre 2000 cars , Oil technology has moved on .
Will the 10w-40 semi oil last the 12000 mile service intervals of the TD4 ?

jamesmartin · Dec 30, 2013

DTO said:
5w-30 fully synthetic is the oil used by landrover when I used to have it serviced by them , I have carried on using that grade of oil on mine . Using 10w-40 semi would be going backwards in time to pre 2000 cars , Oil technology has moved on .
Will the 10w-40 semi oil last the 12000 mile service intervals ?

even with full synthetic i wouldnt want to leave oil in that long

Thor1950 · Dec 30, 2013

DTO said:
5w-30 fully synthetic is the oil used by landrover when I used to have it serviced by them , I have carried on using that grade of oil on mine . Using 10w-40 semi would be going backwards in time to pre 2000 cars , Oil technology has moved on .
Will the 10w-40 semi oil last the 12000 mile service intervals of the TD4 ?

Are you serious???????????? What does the engine manufacture say. Oil company won't fit your engine when things go tits up. 6k max for oil change.oil is cheap compared to a new engine costing several thousand, you a gambler

DTO · Dec 30, 2013

That why I only use correct grade fully sythectic oil as it will last the service interval !
VW have a 2 year or 20000 mile long life oil service but only if you use the correct 5w-30 fully syth to there 504 or 507 spec ,
Use 10w-40 semi in a VW 1.9tdi PD engine and it would not last very long .

I only do about 3000 a year with an annual oil change .

Hippo · Dec 30, 2013

Nodge68 said:
5w30 is to thin for the V6. Iirc it's always needed a semi 10w40 oil.

That's correct. Semi 10w40. Just had a look on Castrols site for our v6 and they quote 0w40 (UK) but also list others depending on temp. I'm sticking with 10w40 semi. I always liked the Castrol adverts when I was little.

Castrol GTX - Liquid Engineering - UK Advert - YouTube

Castrol GTX Advert (1980) - YouTube

jamesmartin · Dec 30, 2013

DTO said:
That why I only use correct grade fully sythectic oil as it will last the service interval !
VW have a 2 year or 20000 mile long life oil service but only if you use the correct 5w-30 to there 504 or 507 spec ,
Use 10w-40 semi in a VW 1.9tdi PD engine and it would not last very long .

i prefer shorter service intervals the oil might last but it gets contaminated ,additives break down,especially as vehicles get older ,long service intervals are for cost reasons not vehicle longevity

Thor1950 · Dec 30, 2013

DTO said:
That why I only use correct grade fully sythectic oil as it will last the service interval !
VW have a 2 year or 20000 mile long life oil service but only if you use the correct 5w-30 fully syth to there 504 or 507 spec ,
Use 10w-40 semi in a VW 1.9tdi PD engine and it would not last very long .

I only do about 3000 a year with an annual oil change .

So are you saying you drive 3k a year it only needs a oil change every 6 years 6 months???????

DTO · Dec 30, 2013

Annual or yearly is something that happens once a calendar year !

I change oil & filter every year .

kev1nlm · Dec 30, 2013

I always change my oil a few times a year generally around holiday time and depending on what we're doing. It normally costs me between 13-20 quid depending on which filters I change. Its not worth messing about for 20 quid!

Spacemonkey... · Dec 30, 2013

DTO said:
That why I only use correct grade fully sythectic oil as it will last the service interval !
VW have a 2 year or 20000 mile long life oil service but only if you use the correct 5w-30 fully syth to there 504 or 507 spec ,
Use 10w-40 semi in a VW 1.9tdi PD engine and it would not last very long .

I only do about 3000 a year with an annual oil change .

This is true, however, it is well documented that their diesel V6s (in Audi A4s etc) go tits up with cam wear on the extended services 'as recommended by VW' even using the correct VW spec oil, whereas owners who had done shorter servicing didn't. Personally, I use VW507 and still change it every 6k or a year, whichever comes first in my van, whereas I changed the computer service schedule in my Golf (PD130) to short service instead of extended and still used VW507. A lot of people in the VW world think the long service schedules in diesels are wrong and merely a marketing ploy. The 1.9 is an amazing engine, but still needs regular oil changes of the highest quality. I always buy the trade packs at my local motorfactors and it's usually quite cheaper as it has less fancy packaging despite being exactly the same as the stuff on the front shelves. I always go by the ACEA number and VW/BMW etc rating.

matt1295 · Dec 30, 2013

i try to change mine every six months

my mileage isnt big so 6months normally ok for me and my L series gets 10W40

confused about oil

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