Petrol for an '83 528i

[AngelMoo]

Well LRP is becoming increasingly hard to find in Melbourne and last time I tried PULP (with and without the additive) it didn't sound all that healthy, it also didn't seem to have as much power as usual. I don't exactly know what I wanted to ask but any info would be appreciated. The car is a V6 1983 528i...and it's white

[billB]

Sorry I have NO idea

[Torque]

Originally Posted by billB

Sorry I have NO idea

Me neither, but then again, I don't know much about V6 BMWs.

[billB]

The hard part for me was the geographic location of the v6 not the v6 in itself!!!!

[Torque]

Originally Posted by billB

The hard part for me was the geographic location of the v6 not the v6 in itself!!!!

I tried to answer this question the other day, and I quit my response half way. From what I gather, LPR is like Regular unleaded and PULP is premium ... I just don't see why the car would run worse on higher octane.

[AngelMoo]

Sorry to confuse everyone
LRP = lead replacement petrol, just like leaded without the lead
PULP = premium unleaded petrol, has a higher octane than regular unleaded
the additive I used is like a lubricant you're supposed to use with the unleaded.
That better?

[arkhaus]

Have you had the engine "tuned up" while running with a tank of PULP? On an '83 it might make a huge difference.

When I worked in my grandfather’s garage and we always told our customers to bring the vehicle in running the grade of fuel they planned to use because switching grades will have a significant impact the vehicle’s performance and make a good tune up seem like it was done poorly. This is especially true of older vehicles that, because they either did not have a computer or they had a very rudimentary one, rely on mechanical settings to operate correctly.

Even with today’s modern engines, running a higher-octane fuel than the one on which the vehicle is designed to run will result in degraded miles per gallon and in many cases poorer performance. The higher the octane the slower the fuel burns, too high an octane will result in unburned fuel being blow out the exhaust valve into the exhaust system. This leads the O2 sensor to report that the fuel mixture is too rich and the pulse width of the injectors is shortened leaning the mixture. Result poorer performance.

I hope this helps.

Mike

[AngelMoo]

Thanks arkhaus, I was going to get the car serviced in the next few weeks anyway, so I'll wait until I fill up with PULP because I still have half a tank of LRP left.