Bobcat coolant substitute?

[OliviaS]

Looking for a Bobcat coolant substitute when the branded stuff isn't handy. Seems like the right answer depends on the exact model/manual and whether the system already has PG or EG coolant in it.

For a top-off especially, what do you check besides the label?

 

[CMRoad]

For a top-off, color isn’t much help anymore. Check the old container or service record first; if that’s unknown, don’t gamble on mixing chemistries. Use distilled water for a small emergency top-up if freezing isn’t a concern, then identify it or drain and refill with the coolant spec from that machine’s manual.

 

[OliviaS]

That makes sense. I’d also want the exact Bobcat model, engine, year, and serial prefix before treating one coolant spec as interchangeable with another. Those details separate a similar-looking machine from one that may call for a different chemistry or service interval.

 

[Santasoul]

For a full refill with unknown or contaminated coolant, follow the exact manual’s drain/flush/refill procedure rather than assuming one approach fits all models. Verify the replacement coolant’s PG or EG chemistry, applicable heavy-duty spec, and whether it’s premixed or concentrate before filling. PG and EG shouldn’t be mixed.

 

[DonJose]

Also check whether what’s in it is conventional, OAT, or HOAT—not just PG versus EG. The jug label or a documented service invoice is the best clue; coolant color can’t sort that out reliably.

 

[Steven]

One more label trap: “50/50” only tells you it’s premixed, not that it matches the required inhibitor package. A concentrate can be correct too, but it needs distilled water mixed to the manual’s ratio. The chemistry/spec line on the jug matters more than the front-label color

 

[JACKBAUER]

If the coolant looks muddy, oily, or has crust/scale around the neck and hoses, I wouldn’t treat it as a simple top-off issue. Same if it’s running warmer than normal or the level keeps dropping with no obvious external leak. That’s when a pressure test and the manual’s flush procedure make more sense than adding another coolant chemistry.

 

[MrQuickMan]

Capacity and change interval are another reason not to use a one-size answer. Even similar Bobcats can have different cooling-system requirements depending on the model, engine, and serial range.

With concentrate, the exact manual and product instructions govern the final mix. Residual coolant or flush water can affect the ratio, so it has to be accounted for rather than assuming half the listed capacity makes it 50/50. Using the specified premix avoids that part of the calculation.

 

[OliviaS]

Right, and that’s the useful split: the manual tells what the machine requires, while the jug label tells whether the replacement actually meets it. “Heavy-duty,” “universal,” or 50/50 by itself doesn’t settle that. If the manual calls for a particular coolant standard/inhibitor package and the label doesn’t plainly claim that spec, it may be a plausible coolant but not a verified substitute. That matters even more on a full fill, where there’s no known compatible coolant left in the system to lean on.

 

[JustaMoment]

On a full flush, the listed system capacity is worth keeping in mind: leftover coolant or rinse water can affect the final mix. The exact manual’s procedure is the only reliable guide for how completely that model drains and how it should be refilled.

 

[tommyboy23]

Small wrinkle: Bobcat sells coolant in both PG and EG versions, and both come as premix or concentrate. So a Bobcat label alone doesn’t prove it matches what’s already in the machine; the chemistry line still has to match.

 

[Paradise]

If the history is unknown, a coolant test can be a useful condition check, but it won’t identify the chemistry. It’s not a green light to mix in a random top-off.

 

[JACKBAUER]

The serial prefix matters more than people think on these, especially where an engine change happened mid-model run. A 2004 S185 and a later one can look like the same answer on a parts counter screen, but the manual tied to that serial range is what settles the coolant requirement and capacity. Model and engine alone get you close; the serial tag keeps a close answer from becoming the wrong one.

Captcha Page

 

[Looky]

Big difference between topping off a known coolant and doing a complete change. If it’s a full change, there’s no compatible coolant left in the system to rely on—match the manual spec exactly.

 

[CMRoad]

If there’s a service invoice or an old jug from the last change, use that before guessing from what’s in the tank. It may show the actual product and chemistry, which is a lot better evidence than color or a generic “universal” label.