What is the worst that could happen when you use a 1.4 bar coolant cap instead of a 1.2 bar cap?

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)

Spring a leak.

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I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k

Split the plastic tanks off your radiator

The suggested replacement from MB is 1.4; I have used it with no ill effects, but I also have a 1.2 and I presently use it. You can still find 1.2's if you look around.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm

Ditto Strife.

Haven't seen a 1.2 in a while. All the caps I've purchased in the last 10 yrs. were 1.4.

That's all I've seen the dealers sell.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

Unless there is a cooling system PROBLEM or leaking head gasket (internal) the 1.4 bar cap won't have ANY effect on the cooling system!

A normal(not overheating) Benz cooling system hardly ever builds even .8 bar pressure..

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Actually caps aren't even rated in bar anymore. They are rated in kilapascals. The newest caps are 140 kilapascals.

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