Oil Change

neildavies · Post by **neildavies** » Tue Jan 16, 2007 8:33 pm

I used an additive in my old 406. It's the type you put in the old oil and run the engine for 5 minutes, then change the oil. Can't honestly said if it made a difference or not.

Post by **Welly** » Wed Jan 17, 2007 7:21 am

I used Forte engine flush in my HDi recently, I would recommend it because I used it, the engine oil stayed a nice colour afterwards for longer than usual (for a diesel) and the oil still looks pretty good 3 months later.

All I know is, if you sent it into Peugeot for an oil change you would get a Forte Flush, fresh oil, and a bottle of Forte injector cleaner, all of which I did myself and the car has been fine.

There was an old myth years ago with crappy old carbourettor petrol engines that these Wynn's type flushes would loosen carbon and waxes inside and then block up the oil ways. As far as I am concerned things have moved on since then. The Forte one I used went into the hot engine like a liquid

it works around with the oil and creates more detergants which stay in the oil until you drain it out after a 3 mile run for example.

It is normally recommended for Diesels, especially where there is a risk of the Turbo oil lines blocking like they do on VW's if the oil is not looked after.

richyb83 · Post by **richyb83** » Wed Jan 17, 2007 11:11 pm

I heard undertrays being mentioned, what a sod they are to work with. The first time I managed to get it off took me about an hour to get the thing back on. The second time I took it off two of the rubber fixings fell out along with a small chunk of the tray. Did a bit of a bodge job trying to repair it with the intention of sorting it in the future. I imagine they are a useful thing to have attached still in terms of underbody water and salt protection. My exhaust has suffered from some major corrosion and battling with rusty bolts is hardly enjoyable.

Post by **Welly** » Thu Jan 18, 2007 7:38 am

The undertray does an important job and is well worth keeping in place.

It keeps the engine bay clean for one, but also it works aerodynamically. Air flowing through the radiator grille will pass over the engine and then down the front of bulkhead or ''firewall'' where the Turbo is located. The warm air will then pass smoothly out underneath the car and continue to the rear end.

Without an undertray fitted the air passing underneath the car will hit obstacles like the sump and other rough shapes and cause turbulant air streams and buffeting which can even reduce the effectiveness of the Radiator.

So, allways try and keep it fitted. I had to fashion some big washers, new holes, and some tie wraps to keep mine in place

Post by **DaiRees** » Thu Jan 18, 2007 9:07 am

My undertray fixings worked fine last time I did the service, but you lot have got me all nervous now

I used an engine flush too, can't say for sure whether it made any difference or not, but my car deserves the best

Also heared the rumor about not using engine flush on older engines, but to be honest I'd never used it before so can't really comment. The only time I've really noticed an improvement in running was the first time I put Magnatec in my old Mundano, 'twas like a different engine for a while, super smooth!

mjb · Post by **mjb** » Thu Jan 18, 2007 10:58 am

I had a flush when I had my oil done the other day. The engine sounds and feels soooo much nicer now. If only I could get the ticking injector fixed up it'd be smooth as silk, but AFAICT injectors are pricey to sort out

HDiAndy · Post by **HDiAndy** » Mon Jan 22, 2007 7:40 pm

I ended up chopping a small section (about 6"x3") of the rear undertray so that I could get better access to the sump plug. The front one is a pain, the first time I took it out some of the bolts were siezed and just spun round. I've secured the rearward ones with cable ties- much simpler and quicker.
The other niggly problem I have is with the fuel filter being too low down- I usually use a big socket and torque wrench to undo it and doesn't allow enough room for leverage
Frankly I prefered my old XUD 306 it was a much quicker servicing procedure

jameslxdt · Post by **jameslxdt** » Mon Jan 22, 2007 7:44 pm

i would NEVER use engine flush, there is a high possibility of not all of it being drained, and if it remains in there after the oil change and can do some nasty damage
i know for a fact that Renault and Volvo forbid the use of engine flushes as they both have a ptfe coating on the inside of the engine which will be destroyed by the flush