Snowglobe

Which Fumoto F105 drain plug to get - F105, F105S or F105N? Or the FG3SX? This is for an 84 ROW.
They all have 20mm-1.5 threads.
The drain plug doesn’t point down so I’d think the F105N is fine, but it looks like the FG3SX actually the most compact (safe) and convenient.
I’m leaning towards the FG3SX. That model also has an aluminum bolt (“bolt is made of a duralumin alloy treated with alumite”).
Looking for forum wisdom on this.
Thanks, Jim

https://www.fumotooildrainvalve.com/f-105.html
https://www.fumotooildrainvalve.com/f105s.html
https://www.fumotooildrainvalve.com/f105n.html
https://www.fumotooildrainvalve.com/FG3SX.html

Zirconocene

Of the F105 series, I think that the N is the most useful since, even without a hose, you still get good control over where the oil will go once you open the valve.

I don't think that the FG part will work very well, to be honest. I don't know if there are big differences between your '84 and my '90 with respect to how the oil pan is shaped, but from what I'm visualizing in my head, I believe that there is not quite enough room in the recess for the body of the valve to fit in that orientation. I think you're going to want something that is aligned more linearly, if that makes sense.

I'll have to go look at my car a little better, but thought I'd at least throw out my memories of installation.

Cheers

GregBBRD

I should keep the ones I remove and throw away, and resell them.
No magnet and they leave 1/4" of oil in the bottom of the oil pan.
Not remotely close to perfect.

Koenig-Specials 928

I've been using one for >15 years now.
As for that 1/4" of oil Greg is talking about I always jack up my car on the passenger side to assist in draining as well
as pouring 1/2L of fresh oil to purge what is remaining,

I also have them on the block (one on each side) for flushing the coolant every 3 years.
There's a thread somewhere about this (I wasn't the first)

Snowglobe

Tell us how you really feel.
I’m in no hurry to get one and can shelve the idea. But while I have your attention, @GregBBRD , do you have similar comments about replacing the coolant plug/bolts? Reference: https://rennlist.com/forums/928-foru...l#post14858963

Snowglobe

By the way, yes I know who Greg is and have have yet to install some items I purchased directly from him. I’m looking to work on the car this winter and spring and was looking into getting the drain valves as part of prep. The forum search turned up nothing for Fumoto F105’s, hence the new thread.

Also, I didn’t find any threads on which oil is best, so ... just kidding. Really. I did not ask.

Snowglobe

Thank you. I was mainly looking for whether I’d get warned against the N due to clearance/safety concerns.
Since you questioned whether the FG3SX would fit, I’m now curious about that, too.

Thank you. Which one are you using: F105, S or N?

You posted about the coolant drain plugs here: https://rennlist.com/forums/928-foru...l#post14858963

GregBBRD

Yeah, sorry. I do have rather strong opinions.
It comes from 50 years of working on Porsches and seeing the mistakes people have made.
And from only relying on myself...no Internet/no "armchair engineers" for most of those years.

These piece should work great for the coolant drains...not enough percentage of coolant left over to matter....and no magnet on the stock plug.

GregBBRD

That works for getting the old oil out.
Still bothers me that there is no magnet.
Maybe one of those "filter magnets" would be a good substitute?
Although ferrous pieces can still go through the oil pump, at least a filter magnet would keep the ferrous pieces from getting to the bearings.

Koenig-Specials 928

" ........ Still bothers me that there is no magnet. Maybe one of those "filter magnets" would be a good substitute?..."

But where would I put it? The pan is alum isn't it?
Ideas?

In the previous 10 years prior to installing the Fumoto I don't remember seeing any significant metal shavings on the OE drain.
My car is daily driven from last snowfall in the Spring to first snowfall in the winter. It gets 3 oil changes/year; well cared for internally (incl ZDDP)

Snowglobe

Maybe he meant a magnet on the oil filter itself.
Like this:

GregBBRD

Most of the 928 engines that I disassemble, these days, have mild to aggressive cam pitting...which puts a lot ferrous metal in the system.
The oil filter will probably stop all of it....
I just don't "like" probably.

NoVector

I think the missing data point is how many oil pans have been repaired because the owner over tightened their drain plug (even w/ a torque wrench)? That's the sweet justice of a Fumoto plug - you never have to worry about stripping that aluminum pan. Ever. Even with a torque wrench.

Canting the car on one side, I think I math'd ~1/2 qt of oil would still remain with a Fumoto plug. So that goes in the negative column. And the no magnet thing would be another.

sendarius

That whole "tighten EVERYTHING with a rattle gun" mentality is why I do all the (basic) servicing on the family cars myself.
Even my daughter's newish Hyundai, serviced at the dealership, had the wheel nuts over-tightened to where she couldn't change a flat with hand tools.

M. Requin

I'm with Greg. I removed my Fumoto drain valve when I realized how much oil remained in the sump.