Author Topic: Oil change (Read 3624 times)

guest1010 · « **on:** September 06, 2009, 08:28:19 PM »

On reading about oil in this link
http://www.carbibles.com/engineoil_bible.html
I see that after refilling the engine with oil the HT lead and fuel pump fuse should be disconnected and the engine turned over until the low oil pressure light goes out. Then reconnect and run the engine. Do dealers and independents do this as a matter of course or do they just fill up and fire up?

Marnie

JazzyB · « **Reply #1 on:** September 06, 2009, 10:03:19 PM »

They just fill and fire them up

guest869 · « **Reply #2 on:** September 10, 2009, 06:20:33 PM »

They will fill up and fire the engine.

On many engines I build (Fiat, Rover V8, B Series) I adapt things so I can spin the oil pump with an electric drill independent of the engine, then I know oil is around the engine and under pressure before fire up.

culzean · « **Reply #3 on:** September 11, 2009, 02:23:04 PM »

If you add molyslip (molybdenum-disulphide) to your oil, the disulphide bit is attracted to metal and the molybdenum plates (the slippy bits) rub together instead of metal-to-metal contact.

It's the one additive worth using as it is very effective at stopping 'cold start wear' - because there is already a coating on the bearing surfaces before the oil gets around them.

And don't worry, the particles are very small and easily pass through the oil filter.

guest1010 · « **Reply #4 on:** September 12, 2009, 09:46:01 AM »

I suppose that most would be unlikely to wait the half hour for the engine to drain fully so the best to hope for is that the engine would not be damaged!

Marnie

Geoffers · « **Reply #5 on:** September 12, 2009, 05:37:46 PM »

I expect tens of thousands of cars have had their oil changed without the paraphenalia you mention, and none of them will have to any harm.

I certainly never did anything like that in twenty years of running a Triumph Stag and it never came to any harm!

Some people are just unnecessarily ultra-cautious (or pedantic)!

springyboy · « **Reply #6 on:** September 28, 2009, 09:18:46 PM »

If the engine has just been rebuilt it would be good to get the oil pumped all round before firing it up, but for a normal oil change there will still be old oil spread all round and this should be sufficient to prevent metal to metal contact until the new oil gets pumped round. If there was a real need to run the engine up to pressure before firing it up then there would be warnings on the oil and filters we buy and we'd have lots of articles on how to spin a motor over without it firing up or dumping unburned fuel in the cat.