the mobil and motul can't be sourced here

i got in contact with liqui moly - they have jlr spec 0w20, but aussie distributor isn't importing it yet, but have plans to

$330 to ship 8L of the castrol 0w20 out of UK

 

Vs $120 max and as low as $70 for 10 litres of the Nulon 5W-20, no brainer of the century IMHO!

 

I got a quart more oil than I needed, but I got this oil change kit...
https://www.roverparts.com/Parts/OCK150

Don't know if they'd ship to you.

 

i ended up buying the penrite enviro 0w20

spoke to my mechanic and of the options available, he suggested this

https://www.penriteoil.com.au/produc...0w-20-full-syn

 

Should be perfectly OK and a helluva lot cheaper than the Castrol brew!
Yep, $60 for a 5 litre bottle on Fleabay = $12/litre vs your quoted Castrol price of $330 for 8 litres = $41.25/litre, so 71% cheaper.

 

for the aussies, here's another option that meets the 945 ford spec

https://www.martiniracing.com.au/sin...0w20-motor-oil

 

Whats the thought on calling for 0W-20 instead of an already light weight 5W-30? I think this is to bump mpg to meet fleet regualtions at the expense of engine life, and oh no, then to sell more cars. I use Redline 5W-25 in the so called southwest US winter and will probably switch to 5W-30 in the coming desert heat.

 

Don't automatically assume that heavier weight oil lubricates better. Tolerances are quite a bit tighter now than in the past requiring lighter weight oil to properly lubricate. 0W-20 or 5W-20 ok, but heavier than that you may be taking a risk unless you're driving around at elevated engine temps all the time.

 

I appreciate the input and have heard the same, but it seems odd that cars like the Nissan GT-R, Porsche GT-3 (Porsche recommends up to 60W in southern US States) and BMW M cars call for 40W oils. Are these manufactures really that far behind in tolerances or is the above urban legend that could be harmful, too.

 

I don't think that going 'heavier' one grade will cause any issues.

I think it is significant that Honda (and Lotus, when they use otherwise stock Toyota engines) specify a slightly heavier oil on engines that they think will be thrashed driven spiritedly!

 

It'll probably buy you 1 less mpg. It seems like manufacturers of lower mpg fleets with typically lower customer logged mileage are the ones going to 0-20W light weight oils. I think it could be detrimental to follow their advice, given the immense mpg pressure they are under from the usual government morons.

 

Less than that. IMO, folks can't tell any MPG variance when they go thicker. But the first number indicates cold-engine flow capability.

In my youthful days (before learning about BobIsTheOilGuy.com ) I thought that thicker oil was always better...ran 20W-50 on our Acura that was spec'd for 5W-30. No issues over 185K miles. That car had oil-pressure actuated VTEC, but no variable induction as the Jag does.

 

i don't have the mechanical knowledge to start trying diff weights, i'll just stick with the factory recommendation on this one

i'd only go about as far as forgetting the spec bs and choosing a high quality 0w20 oil - and i still might as i haven't actually done the oil change yet

 

From my reading on this and as per some earlier comments, as far as I can figure out there is only one reason that JLR changed the recommended oil spec from 5W-20 to 0W-20 - to eke out a tiny fraction of improved fuel economy on the government tests, maybe 1 mpg at best. I blame CAFE and the Euro equivalents!

 

 

Right, the question is about the oil weight: the second number. Jag and others are going to 20 weight, while highest performance Porsches are going to 50 or even as high as 60, BMW recommends 40. Why?

I think the only logical explanation is the lighter weight uses are bumping their mpg averages, not minimizing wear.

 

yep they are choosing the weight for the increased fuel efficiency

when researching these oils, every manufacturer pitches the 20 weight as the enviro conscious spec

 

Yeah, wearing out the engine early to gain 1 mpg is real efficient. Sounds like its about the manufacturers selling more cars by hopping on a phony enviromental bandwagon.

 

it's about the manufacturers struggling to meet ever increasing enviro/emission laws that are choking all their current drivetrains

 

The take-away is don't confuse the manufacturer's best interest with your best interest. Light weight oil might cause excessive wear.