Thread: food for thought - 5W-30 vis 5W-40 engine oil

Originally Posted by 101RRS

So what is wrong with the specified grade of oil - LR specified it for a reason or is it that because you see something on social media it must be true.

it has been superseded is why. IF you can find the original spec oil then let everyone know about it mate.

Originally Posted by 101RRS

So what is wrong with the specified grade of oil - LR specified it for a reason or is it that because you see something on social media it must be true.

Cost and availability is the reason why

i have been using the Penrite enviro + 5w/30 C1 full syn in my 3 litre 2010 no DPF. get 7 litres on sale for about 63 dollars. was using castrol professional C1 previously. change every 10K all going well so far.

Originally Posted by Jpdv

But they also specify a sealed for life transmission...

Not true - there is nowhere in general LR service documentation that specifies the transmission is sealed for life - an old wives tale.

LR documentation specify the change interval to be 10 years or 250,000km for the 6 speed - and earlier for arduous use which includes commuting use.

Now this is far to long but is not sealed for life.

Originally Posted by PeterOZ

it has been superseded is why. IF you can find the original spec oil then let everyone know about it mate.

I can find full syn 5W30 everywhere.

Originally Posted by 101RRS

Not true - there is nowhere in general LR service documentation that specifies the transmission is sealed for life - an old wives tale.

LR documentation specify the change interval to be 10 years or 250,000km for the 6 speed - and earlier for arduous use which includes commuting use.

Now this is far to long but is not sealed for life.

That's fascinating, and I'm grateful for the info. But you are still proving my point with your own words... If 'Now this is far too long' is applicable to a LR documentation specification (as you state), then we can reasonably question whether they have got their oil recommendation right too, as opposed to your explicit dismissal of the original poster...

I don't know the answer in either case, but you can't have it both ways - either LR documentation is gospel, or it isn't - you don't get to pick and choose which bits are unarguable in order to suit your opinion. One of the values of a forum like this is fact checking, and asking fair questions. Dogmatic dismissal doesn't help.

Originally Posted by coopers1969

i have been using the Penrite enviro + 5w/30 C1 full syn in my 3 litre 2010 no DPF. get 7 litres on sale for about 63 dollars. was using castrol professional C1 previously. change every 10K all going well so far.

Penrite C4 enviro+ 5W30 for the past 100,000km or so, changed every 10,000km.

The LR oil recommendation sways to the fuel economy side for specs. My belief is there are better oils out there on the market that offer better wear protection and worse fuel economy, but they are not LR spec.