Engine Oil Advice
Discussion
The car is due a service in a few weeks and, whilst going through old invoices, I have noticed I have gone from using OW/30 engine oil in 2007 to 5W/30 engine oil in 2009 & 2011.
Not too sure how this has happened but I imagine I probably followed the advice given by the salesman at the motorfactors (ECP, GSF) I used at the time of purchasing the oil.
Question is, am I using the correct engine oil?
As the car is due a service in the next few weeks now would be a good time to rectify this if the oil currently being used, 5W/30 is in-correct.
BTW, the car is a VW Golf MK4 1.8T GTi which is on a long life (every 2yrs) service regime.
Not too sure how this has happened but I imagine I probably followed the advice given by the salesman at the motorfactors (ECP, GSF) I used at the time of purchasing the oil.
Question is, am I using the correct engine oil?
As the car is due a service in the next few weeks now would be a good time to rectify this if the oil currently being used, 5W/30 is in-correct.
BTW, the car is a VW Golf MK4 1.8T GTi which is on a long life (every 2yrs) service regime.
The cold viscosity is the 0/5 number; notionally a 0 weight oil will provide protection in a cold start a bit quicker than a 5 weight number, but unless the engine is particularly sensitive to oil weight I would think that the attention you've paid to oil changes will more than make up for it.
Thank you both for putting my mind at ease. 
I just nipped into the garage and looked at the old oil containers.
The car is on a 2001 plate and has been regularly serviced every 2yrs.
The first 4 yrs (2003 & 2005) was via the VW dealer who used 0W/30 oil.
The first non-VW dealer service was in 2007 and 0W/30 oil was still used but in 2009 & 2011 this switched to 5W/30.
As an aside, is the left over oil from the last service a couple of years ago OK to use?
(I'd imagine the really old 0W/30 oil should be carefully disposed off as it's probably past it's shelf life).

I just nipped into the garage and looked at the old oil containers.
The car is on a 2001 plate and has been regularly serviced every 2yrs.
The first 4 yrs (2003 & 2005) was via the VW dealer who used 0W/30 oil.
The first non-VW dealer service was in 2007 and 0W/30 oil was still used but in 2009 & 2011 this switched to 5W/30.
As an aside, is the left over oil from the last service a couple of years ago OK to use?
(I'd imagine the really old 0W/30 oil should be carefully disposed off as it's probably past it's shelf life).
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