Didn't want to trouble you Martin.

Still not clear if FL30 oil will do damage?

Bus went well on a recent event. It is not really that low on oil. just a thin line 1 m m down. I did not put any oil in as I was worries about this FL30 causing problems.

Have ordered HD 30 to be safe. Just needs a half a cup to top it up. Need to know what to do with this FL l30 ????

Have been away for a bit and only recently saw. these replies

Thanks for all the input

My bus number (if any): RCL2259

If this has a proper RM dipstick then it is calibrated in 'Gallons to Add'. Most modern vehicles with an electronic oil level indication on the dash will throw a fault message if the oil level is not kept just below the full mark.

A qucik google search reveals FL30 is a Comma oil, suiltable for older naturally-aspirated diesel engines. so it should be suitable for AEC engines. But heed what I said earlier about using a a multigrade in the 760 engines.

These days we are not talking about these engines doing a full day's work every day of the year or in coaches, thumping along the motorway flat out all day. with the more gentle lifestyle I feel too many people make a lot of fuss about what oils to use. Tony Lewis at the London Bus Museum used to work for one of the major oil companies and he enlightened me as to how oils have developed over the years.

Yes you have to use a mineral oil in RT and RF diffs, they have phospher bronze crown wheels which will rot if you use an EP grade oil. Similarly it's not good using a high spec oil suitable for a modern turbo engine in for your RM engine. It's ok as a "get you out of trouble" situation, but ot long-term use. Engines without filters aren't designed to run on detergent based oils, they need a straight SAE30 or whatever.

If I still had the Reliance handbook I"m sure it would tell me what engine oil to use in the 760.

A look in the RF workshop manual shows different names for the same type of engine oil, each oil company had its own name for the same sort of blend. FL30 is SAE30.

https://www.commaoil.com/commercial-vehicles/products/view/580

My bus number (if any): RML2532