2000 7.4 Horizon plugs

[douglee25]

The replacement plug is - NGK 2318 BR6FIX

 

[Pirate Lady]

10-40 too thin for my liking unless you live in alaska. Is that what you've been using?

I been using straight 40 because that was recommended in 91. Didn’t know if I should change being technology has advanced.
Don’t fix what ain’t broke, right? Guess I’ll stay with 40W.

 

[scoflaw]

Can you even find a good grade of 40w? I like 20-50 myself Mobil ! or VR racing

 

[Pirate Lady]

Will look into the 20 50. 40w is getting hard to find, hence the original question.

 

[Bill Curtis]

Be diligent about the oil you choose to use, as the older engines with flat tappet cams (like my GenV 7.4) need the zinc content found in most racing / off road oils like the VR1.

I haven't used a 50 wt oil in any engine (except my old 426 Hemi and my Harley) and am a tad concerned about excessive pressure / low flow when cold.

If too thick on an engine with good tolerances on bearings, I would be concerned about lack of volume / flow on a cold start. I would rather have a little lower pressure with better volume / flow and still maintain a good pressure at idle on a warmed up engine. Trial and error, I suppose.

The newer engines, like Vortec's, that have roller cams like the newer style oils better.

 

[Gallf1]

I am using the Mercruiser 25-40w non-synthetic at Walmart for $28.47 a gallon (about $7.15 a quart) on my 2000 454 MAG MPI's in NE Florida
https://www.walmart.com/ip/Quicksil...ne-Oil-SAE-25W-40-1-Gallon-8M0078620/35792205

 

[Pirate Lady]

Be diligent about the oil you choose to use, as the older engines with flat tappet cams (like my GenV 7.4) need the zinc content found in most racing / off road oils like the VR1.

I haven't used a 50 wt oil in any engine (except my old 426 Hemi and my Harley) and am a tad concerned about excessive pressure / low flow when cold.

If too thick on an engine with good tolerances on bearings, I would be concerned about lack of volume / flow on a cold start. I would rather have a little lower pressure with better volume / flow and still maintain a good pressure at idle on a warmed up engine. Trial and error, I suppose.

The newer engines, like Vortec's, that have roller cams like the newer style oils better.

Ya, I read about the flat tappet cams.
Advance showing 40W in stock, Fram & Valvoline. Will stop by tomorrow.

 

[Nauti 97]

The replacement plug is - NGK 2318 BR6FIX

Thanks douglee25
I will look into purchasing those.

 

[Bt Doctur]

25 w -50 or 20W-50
MR43 LTS (long reach) MR43T short reach

 

[techmitch]

Ah, it seems as though has served at least somewhat closely.

Wow, never seen that on a merc. Usually it's a AC MRXXX (43T) rings a bell.

25 w -50 or 20W-50
MR43 LTS (long reach) MR43T short reach