Oil filter

Posted by Ken Sadler On 2011/6/19 9:26:38

Hi

I'm planning crank case oil change on my 745. I dismantled the Purolator case and found that the conversion has been done inside to accept a modern filter.

The filter fitted at the moment is a Fram PH43 unit. This is not readily avaiable in the UK and I've seen very bad reports over the quality of these units.

It occurs to me that most filters for automotive use are 3/4" x 16 UNF thread with 2 1/2" diameter so in theory I could buy any brand from my local motor shop.

However, it does depend on filtration rates, capacity (the Fram unit seems much smaller than original) and bypass pressure setting.

The Fram unit is much smaller than the original Purolator in terms of volume. Presumably this would affect crank case pressure? The pressure is a healthy 40lb. Is this related?

So what would you recommend?

Thanks