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I contacted FRAM re: FRAM PH8A (FL1A equiv) and FRAM PH977A (FL299 (larger) equiv.) They indicate that the larger one is not as efficient as the smaller filter. The larger had a 30 micron rating @ 97% eff.compared to a 20 micron rating @ 97% eff. for the smaller one. They indicated the larger...

According to the WIX website their FL1A equivalent is WIX #51515 and their larger FL299 equivalent is WIX #51773. They indicated they were the same except the micron ratings. WIX #51515 (FL1A equiv.)had a nominal micron rating of 20. They did provide the Beta ratio of 2/20=13/23. Which I...

My goal is to use a larger filter than the FL1a that meets or exceeds its filtering ability.

I understand. It am having difficulty locating specs on the Motorcraft filters.

So using that theory the FL1a and FL299 could be the same.

Makes sense and Thanks for bringing it up. I assumed that when a filter micron rating was given or advertised, it was at a standard efficiency rating. I contacted Hastings and they indicated the following: #LF115 (FL1a cross ref) Nominal micron rating 12 @ 50% eff. 30 micron @98% eff. #LF426...

I didn't ask Hastings or anyone who has posted micron ratings here about the efficiency. Should I have?

I thought I would share my findings. As suggested by Greasymechtech, I contacted Hastings regarding their filters that cross reference to the Motorcraft FL1a. They had a number of them. One is Hastings #LF115 which is the same physical size as the FL1a. The Hastings LF115 has a Micron rating of...

Good info OVERKILL. Thank You

Thanks for the micron ratings.

Thank You for the info. Although I am sure the FL1A filters are adequate, I was looking to see if there was an improvement in oil capacity and lower average oil temps as you mentioned simply by putting on a different filter. I will look into the #51459. Considering Ford uses these filters on...

I can see your point. I guess I just wanted to compare. Thank You

No I don't.

I am considering using the Motorcraft FL299 (longer) oil filter on my 460 engine instead of the FL1A filter. Does anyone know what the specs of both of these filters are? I would like to make sure the longer FL299 filter specs are as good or better than the FL1A filter specs. I understand these...

Thank You again. I will go with the Valvoline which I already have. Thanks for all your help.

Just to clarify from the link. XY-75W90-QLS which is the 75W90 Synthetic Axle Lubricant?

I appreciate the responses and recommendations however I would like to stick with Motorcraft gear oil. I have looked at the link's products and I have no way of knowing what the spec of the manual recommended oil is to compare it to the current Motorcraft oils (such as the XY-75W90-QLS...

I know it must be for a case. I came across these websites when I googled it. The one said it wasn't available any longer. I have since called three Ford dealers and: -one said they no longer carry it and to just use any 75x90 like Valvoline. -another said to use their Motorcraft 80x90...

I have a 2001 Ford Expedition 4x4. I want to replace the front differential fluid and according to the manual it recommends "Motorcraft SAE 75w90 Premium 4x4 Front Axle Lubricant" part no. XY-75W90-TQL. I have searched the Motorcraft website and I am unable to see this product or if and what has...