VW TDI PD oil

alankearn

Since I bought my 1.4 TDI PD VW Polo in 2002 (yes I know its old but its only done 17,000 miles) I have changed the engine oil every year using the recommended 5w40 semi synthetic 505.01 oil (Millers). I have always bought a 5 litre container of oil but the engine only needs about 4 litres so I always have about a litre left, this builds up so about every fourth year it has built up so I dont have buy for that particular year.I now have a build up of about 3 litres and as it is near to oil change time I went to buy a 5 litre container of the recommended oil only to find Millers have discontinued it and say I should now use their recommended full synthetic (not semi) oil

See here
Millers Oils XFE - PD 5w-40 Semi-synthetic Engine Oil

So now to my questions
I presume it is OK to mix synthetic and semi synthetic oils.
If the answer to this question is no would it be OK to mix a different manufacturers semi synthetic oil with the Millers oil

ALSO
I am sure a few years ago I read that if you had used semi synthetic oil for a number of years and you changed to full synthetic there was a chance you could get oil leaks, any truth in this or is it a "old wife,s tale".


Thanks

BeenThroughItAll

alankearn wrote: »

1: I presume it is OK to mix synthetic and semi synthetic oils?

2: Would it be OK to mix a different manufacturers semi synthetic oil with the Millers oil?

3: Any truth in this or is it a "old wives' tale"?

1: Yes - as long as it meets 505.01 or later 507.01 it'll be OK.
2: Yes - as long as it meets 505.01 or later 507.01 it'll be OK.
3: No truth in it.


(caveat to 3: maybe years ago, but not a problem I've ever encountered and I've mixed all sorts in all kinds of vehicles - I've personally run at least 40 cars in the last ten years, and I've always put in either semi or fully synth, dependent on mfr recommendation, without any knowledge of what had gone in before, and have never had sudden oil leaks)

alankearn

BeenThroughItAll wrote: »

1: Yes - as long as it meets 505.01 or later 507.01 it'll be OK.
2: Yes - as long as it meets 505.01 or later 507.01 it'll be OK.
3: No truth in it.


(caveat to 3: maybe years ago, but not a problem I've ever encountered and I've mixed all sorts in all kinds of vehicles - I've personally run at least 40 cars in the last ten years, and I've always put in either semi or fully synth, dependent on mfr recommendation, without any knowledge of what had gone in before, and have never had sudden oil leaks)

That is quite a comprehensive super quick reply

Thank you very much

BeenThroughItAll

alankearn wrote: »

That is quite a comprehensive super quick reply

Thank you very much

My pleasure.