Impreza 1.6 - MPG & performance

Hi guys.

Anyone hear able to explain this

I'm driving a 00 1.6 Impreza (classic) totally standard with 154k miles on the clock. I generally get an oil & filter change done every 5 to 8 thousand miles. After the last few services I have noticed it to be heavier on petrol for about the first 3000 miles after a service and after that generally gives better MPG. It could be about 34 to 36mpg after a service and then up to 39 to 42 after a service. Could it be something to do with the viscosity of the oil after it gets a service?

I also notice a big variation in the performance of the engine (power) from time to time and generally after an oil change is a bit slower??

Anyone else in a 1.6 ever notice this? Interested to hear if you have.

Mick

welcome along .to be honest after having 2 1.6 imprezas there shouldn.t be that much of a difference the mpg or performance before or after a service . if anything you should be getting more mpg after the service with new plugs filters and stuff . do there know there stuff where it's getting serviced mabey needs a tune up are there using the wrong plugs :dont know: :dont know:

Dunno how your getting between 30 and 40 mpg lad , My 1.6 wouldn,t even come close to 30 if i tried ,

Hope you get sorted out

never noticed much variation before or after service
great car - so cheap to buy and insure - that 3rd gear!!!

if anything performance would be better after service. hard to understand how mpg would be lower on fresh plugs, filters and oil??

thanks for the replies...

yea it's a bit strange alright....thought I was just imagining it myself at first but its seemed to be a pattern over the last four services, due a service now again so will be interesting to see how it goes this time. I get it serviced in a former Subaru main dealer so they are well familar with them. To be honest it's pretty good mpg to be getting anyway so it's not a problem but curious as to the variation.....and the variation in power does be a good bit too. I do be driving another 1.6 Impreza (1999) a good bit to and at times there is no camparison in the power. One thing I'm pretty sure of is they have a preference for good quality petrol

Had 2 1.6 and both were terrible on petrol. Nearly as bad as a wrx

[quote author=kanye from the west link=topic=16557.msg203451#msg203451 date=1248143520]
Had 2 1.6 and both were terrible on petrol. Nearly as bad as a wrx
[/quote]

Were they front wheel drive or AWD? I'd imagine the AWD would be much heavier on the juice alright.

Mick

First was a classic and FWD, second was a 05 and was AWD

Hard 2 understand the power thing and dont know how u gettin tat good mph onder2
Our 05 scooby drinks juice and no power compared 2 my turbo one but lovely car 2 drive